IIT JEE -2013 coordination chemistry "BORON- FAMILY"

IIT-JEECHEMISTRYP. JOY BORON FAMILYINORGANIC

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EXERCISE # 2 (ELEMENTAL BORON)

Q.1 Which of the following is most abundant among group 13 elements inthe earth's crust–

(A) B

(B) Al

(C) Ga

(D) None of these

Q.2 Which one of the following has the lowest m.p.

(A) B

(B) Al

(C) Ga

(D) Tl

Q.3 Which of the following is used in high temperature thermometry –

(A) Na

(B) Ga

(C) Tl

(D) Hg

Q.4 On heating with carbon which of the following elements do not formcarbides –

(A) B

(B) Al

(C) In

(D) Ga

Q.5 The elements which react with air more readily are –

(A) Al

(B) B

(C) Ga

(D) Tl

Q.6 Which of the following pairs do not represent a typical non-metal andmetal combination –

(A) B, Al

(B) Al, In

(C) Ga, Tl

(D) Al, Tl

Q.7 Elements of Group 13 not reacting with water are –

(A) B

(B) Al

(C) ln

(D) Ga

Q.8 Which one of the following elements has the highest melting point –

(A) Al

(B) B

(C) Ga

(D) Tl

IIT-JEECHEMISTRY P. JOYBORON FAMILY INORGANIC

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Q.9 Boron behaves as a –

(A) Non-metal

(B) Metal

(C) Metalloid

(D) Transition metal

Q.10 Which of the following does not react with aqueous NaOH –

(A) B

(B) Al

(C) Ga

(D) Tl

Q.11 Which of the following does not react with water –

(A) Al

(B) Na

(C) Tl

(D) B

Q.12 Which one of the following is a correct statement –

(A) Al(OH)3 is more acidic than that of B(OH)3

(B) B(OH)3 is basic while that of Al(OH)3 is amphoteric

(C) B(OH)3 is acidic while that of Al(OH)3 is amphoteric

(D) B(OH)3 and Al(OH)3 are amphoteric

Q.13 Indium is used :

(A) To dope crystals to make p-n-p transistors

(B) In thermistors

(C) In low m.p. solder

(D) All correct

Q.14 Moissan boron is

(A) Amorphous boron of ultra purity

(B) Crystalline boron of ultra purity

(C) Amorphous boron of low purity

(D) Crystalline boron of low purity

Q.15 Both boron and aluminium show difference in properties from theremaining members of group 13. This is because

(A) Both B and Al have smaller size as compared to othermembers of the family.

(B) Both B and Al have high values of ionization energy

(C) Both B and Al have only the valence electrons (ns2 np1)outside the noble gas core while the remaining elementshave filled d and f-orbitals in between the noble gas coreand the valence electrons

(D) None of the above.

Q.16 Which of the following elements is the most electropositive ?

(A) Al

(B) B

(C) Ga

(D) In.


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Q.17 Which of following element of Group 13 is liquid at room temperature?(A) Boron(B) Al(C) Ga(D) Tl

Q.18 How many non-metals are there in Group IIIA(A) 1(B) 2(C) 1(D) 4

Q.19 Which of Group IIIA element is hardest -(A) B(B) Al(C) Ga(D) In

Q.20 Which of the following properties in Group IIIA doesn't smoothlyincrease-

(A) Melting point(B) Atomic mass(C) Atomic number(D) Density

Q.21 The element that marks the paper like lead is–(A) Ga(B) Ti(C) B(D) Tl

Statement explanation type problemsIn each sub question below a statement S and an explanation E is given. Choosethe correct answers from the codes A, B, C, D given for each question.

(A) Both S and E are correct and E is correct explanation of S.(B) Both S and E are correct but E is not correct explanation of S.(C) S is wrong but E is correct.(D) S is correct but E is wrong.

Q.22 Statement : Boron has high m.pt. and b.pt.Explanation : Boron exist as a giant covalent, polymeric structure both insolid as well as in liquid state.

Q.23 Statement : Pure boron is difficult to be formed.Explanation : Melting point of pure boron is very high and it is corrosive inliquid state.

CONFIGURATION/OXIDATION STATE/INERT PAIR EFFECT :Q.24 Monovalency of heavier members of group 13 elements can be

explained on the basis of–(A) Their low ionization energies(B) Their low electronegativity values(C) Their large sizes(D) Inert pair effect


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Q.25 The most probable oxidation state of an elements with the electronicconfiguration of 1s2 2 s2 2 p6 3 s2 3 p1 is –

(A) + 1

(B) + 2

(C) + 3

(D) – 1

Q.26 The first ionization energy of B is less than that of Be because –

(A) Boron has higher nuclear charge

(B) Atomic size of B is more than that of Be

(C) Atomic size of B is less than that of Be

(D) B has one electron in the p-orbital

Q.27 Which of the following configuration is characteristic of Group 13(Group III A) elements–

(A) ns2 np1

(B) (n – 1) d1 ns2

(C) (n – 1) d10 ns2 np2

(D) ns2 np3

Q.28 Group 13 elements exhibit –

(A) Only + 3 oxidation state

(B) Only + 1 oxidation state

(C) Both + 1 and + 3 oxidation states

(D) + 1, + 2 and + 3 oxidation states

Q.29 An element with atomic number 31 belongs to –

(A) s - Block

(B) p - Block

(C) d - Block

(D) f - Block

Q.30 Which of the following set of atomic numbers belongs to Group 13elements –

(A) 3, 11, 19

(B) 2, 10 , 18

(C) 31, 13, 49

(D) 7 , 17 , 31

Q.31 The electronic configuration of gallium is –

(A) [Ar] 3 d10 4 s2

(B) 3 d9 4 s 1

(C) [Ar] 3 d10 4 s1

(D) [Ar] 3 d10 4 s2 4 p1

Q.32 Which of the following electronic configuration would you expect tohave the lowest ionisation energy –

(A) 1 s2 2 s2 2 p1

(B) [Ne] 3 s2 3 p1

(C) [Kr] 4 d10 5 s2 5 p1

(D) [Ar] 3 d10 4 s2 4 p1


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Q.33 Which of the following exhibits inert pair effect –

(A) B

(B) Al

(C) Tl

(D) Sc

Q.34 Thallium shows different oxidation states because –

(A) It is transition element

(B) Of inert pair effect

(C) Of its amphoteric

(D) Of its higher reactivity

Q.35 In which of the following elements + 1 oxidation state is more stablethan + 3

(a) B

(B) Al

(C) Ga

(D) Tl

Q.36 Inert pair effect plays an important role in case of –

(A) F

(B) Al

(C) Si

(D) Tl

Q.37 Which member of Group 13 does not exhibit the group valency in itscompounds –

(A) Boron

(B) Aluminium

(C) Gallium

(D) Thallium

Q.38 Tll3 is an ionic compound which furnishes the following ions in solution–

(A) Tl3+ and l– ions

(B) Tl+ and I3– ions

(C) Tl+ , l– ions and l2(D) Tl+ and l– ions

Q.39 Thallium tribromide at room temperature, slowly gets converted toone of the following species –

(A) sp3

(B) sp2

(C) sp

(D) sp3 d2

Q.40 In which of the following elements, the inner electronic configurationcontains 10 d-electrons –

(A) B

(B) Ga

(C) Al

(D) ln


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Q.41 + 3 Oxidation state is more characteristic in case of –

(A) B

(B) Al

(C) Ga

(D) Tl

Q.42 Boron does not form B3+ ions whereas Al forms Al3+ ions. This isbecause –

(A) The size of B atom is smaller than that of Al

(B) The sum of lE1 + lE2 + lE3 of B is much higher than that of Al

(C) The sum of lE1 + lE2 + lE3 of Al is much higher than that of B

(D) Both (A) and (B)

Q.43 Which of the following ions is rarest to be found-

(A) Al3+

(B) B3+

(C) Ga3+

(D) In3+

Q.44 Which of the metal in Group IIIA has easy availability of M3+ ions inaq. solution but not in its solid state-

(A) Al3+

(B) B3+

(C) Ga3+

(D) In3+

Q.45 Tl exist as ............ form in its more stable form due to .............

(A) +3, inert pair effect

(B) +1, inert pair effect

(C) +1, lanthanide contraction

(D) +3 lanthanide contraction

Q.46 Inert pair effect is incorrectly related in-

(A) It is the effect observed in s and p block.

(B) It is the effect observed in only p-block due to poor sheildingof d-orbitals.

(C) It is observed in d-block due to good shielding of p-orbital.

(D) In ns2 np2 configuration ns2 is the inert pair.

Q.47 Which of the following ions in aq. state is not observed-

(A) B+

(B) B+3

(C) Tl+1

(D) Tl3+

Statement explanation type problems :

In each sub question below a statement S and an explanation E is given. Choosethe correct answers from the codes A, B, C, D given for each question.

(A) Both S and E are correct and E is correct explanation of S.

(B) Both S and E are correct but E is not correct explanation of S.

(C) S is wrong but E is correct.

(D) S is correct but E is wrong.


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Q.48 Statement : Boron has higher I.E. than Be.Explanation : Boron loses first electron easier than beryllum doing so it attainsinert gas configuration.

Q.49 Statement : The ionisation energy for 8th group elements is far greater thanI.E.3.Explanation : Loss of 4th electron from 3rd group elements is as difficult asloss of electron from an inert gas.

Q.50 Statement : TlI3 ionises into Tl+ and I3–

Explanation : Tl+1 ion is more stable than Tl+3 ion due to inert gas effect.

DIAGONAL RELATIONSHIP AND TREND :Q.51 The three sets of elements are given below –

(i) Boron, aluminium, gallium, beryllium(ii) Boron, aluminium, gallium, indium(iii) Boron, aluminium, thallium, rubidiumWhich of the above set/s contains an element which does not belongto Group 13 and yet its properties are quite similar to one of theGroup 13 elements –

(A) (ii)(B) (iii)(C) (i)(D) (i) and (iii)

Q.52 Which of the following pair of elements show diagonal relationship –(A) Li and Mg(B) Be and Al(C) B and Si(D) All of them

Q.53 Be and Al show diagonal relationship and thus :(A) Their oxides are soluble in alkali solution forming [Be(OH)4]

2–

and [Al(OH)6]3–

(B) They form complex anion BeF42– and AlF6

3–

(C) BeCl2 is Lewis acid but AlCl3 is a Lewis base(D) BeO is basic but Al2O3 is amphoteric.

Q.54 Both boron and aluminium show difference in properties from theremaining members of Group 13. This is because –

(A) Both B and Al have smaller size as compared to other membersof the family

(B) Both B and Al have high values of ionization energy(C) Both B and Al have only the valence electrons (ns2 np1) outside

the noble gas core while the remaining elements have filled dand f-orbitals in between the noble gas core and the valenceelectrons

(D) None of these

Q.55 Generally the atomic and ionic radii increase with increase in atomicnumber down the group. But the atomic size of aluminium and galliumis almost the same. This is because –

(A) The nuclear charge of Ga is higher than that of Al(B) Gallium contains intervening d-electrons which do not screen

the valence electrons effectively(C) The ionization energies of Ga and Al are comparable(D) All the three above


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ANSWER KEY

Q.56 The first ionization potential of aluminium is smaller than that ofmagnesium because –

(A) Atomic size of Al > Mg(B) Atomic size of Al < Mg(C) Al has one electron in the p - orbital(D) Atomic number of Al > Mg

Q.57 Which of the following oxides is strongly basic–(A) B2O3

(B) Al2O3

(C) Ga2 O3

(D) Tl2O

Q.58 The basic oxides out of the following are

(A) B2O3(B) Tl2O(C) In2O3(D) Al2O3

Q.59 Which of the following hydroxides is acidic ?(A) B(OH)3(B) B(OH)3 (C) In(OH)3 (D) TlOH

Q.60 Which of following trends of Group 13 is correct-(A) Density increases down the group.(B) M.p. first decreases, till Ga, then increases.(C) B.P. gradually decreases.(D) Stable oxidation state remain the same from top to bottom

down the group.

Q.61 Which of following is correct about atomic radii of Group 13 elements?(A) These are smaller than Group 2(B) Ga is smaller than Al(C) Atomic size generally increases down the group(D) Ionic radii follow a regular trend.

Q.62 Which of following order for reduction potential of Group III elementsare correct ?

(A) Al > Ga > In > Tl(B) Tl > In > Ga > Al(C) Al = In = Ga = Tl(D) None of these

Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15Ans. B C B D A B A B A A D C D C BQue. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30Ans. A C A A A D A A D C D A C B CQue. 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45Ans. D C C B D D D B D D A,B,C D B A BQue. 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60Ans. A,C A C A A C D A,B C B C D B A A,B,CQue. 61 62Ans. All A


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EXERCISE # 2A (BORIC ACID)

Q.1 Which of the following statements regarding boric acid (H3BO3) isfalse ?

(A) It acts as a tribasic acid(B) It is soluble in hot water(C) It has a planar structure(D) It acts as monobasic acid

Q.2 H3BO3 is :

(A) Monobasic and weak Lewis acid(B) Mono basic and weak Bronasted base(C) Monobasic and strong Lewis acid(D) Tribasic and weak Bronsted acid

Q.3 Orthoboric acid H3BO3 behaves as weak monobasic acid giving H3O+

and :(A) H2BO2

+

(B) H2BO2–

(C) [B(OH)4]–

(D) [B(OH)4]+

Q.4 In the following reaction : B(OH)3 + H2O → [B(OH)4]– + H+

(A) B(OH)3 is Lewis acid(B) B(OH)3 is a Lewis base(C) B(OH)3 is amphoteric

(D) None is correct

Q.5 Which of the following statements are true for H3BO3 ?(A) It is mainly monobasic and a Lewis acid(B) It does not act as a proton donor but acts as an acid by

accepting hydroxy ions(C) It has a layer structure in which BO3 units are joined by

hydrogen bonds(D) It is obtained by treating borax with conc. H2SO4

Q.6 Boric acids is polymeric due to –(A) Its acidic nature(B) The presence of hydrogen bonds(C) Its monobasic nature(D) Its geometry

Q.7 H3BO3 and HBO2 differ in :(A) Oxidation number(B) Basicity(C) m.p.(D) structure

Q.8 Select correct statement(s) abot H3BO3 :

(A) It has triangular BO33– units

(B) In solid states, molecules are hydrogen bonded(C) Both the statements are correct

(D) None of the statements is correct


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Q.9 Which one of the following statements about H3BO3 is not correct ?

(A) It is a strong tribasic acid

(B) It is prepared by acidifying an aqueous solution of borax

(C) It has a layer structure in which planar BO3 unt are joinedby hydrogen bonds

(D) It does not act as proton donor as it acts as a Lewis acidby accepting hydrolyl ions

Q.10 Boric acid

(A) Exists in polymeric form due to inter-molecular hydrogenbonding.

(B) Is used in manufacturing of optical glasses

(C) Is a tri-basic acid

(D) With borax, it is used in the preparation of a buffer solution.

Q.11 When strongly heated, orthoboric acid gives –

(A) HBO2

(B) H2B4O7

(C) B2O3

(D) B

Q.12 When orthoboric acid (H3BO3) is heated, the residue left is

(A) Metaboric acid

(B) Boron

(C) Boric anhydride

(D) Borax

Q.13 Boric acid is prepared from borax by the action of :(A) Hydrochloric acid

(B) Sodium hydroxide

(C) Carbon dioxide

(D) Sodium carbonate

Q.14 Which one is metaboric acid –

(A) HBO2

(B) H2B4O7

(C) H3BO3

(D) B (OH)3

Q.15 B(OH)3 + NaOH � Na[B(OH)4] (aq) Addition of which of the followingcompound makes the reaction to proceed in the forward direction :

(A) Cis-1, 2-diol

(B) Trans-1, 2-diol

(C) Borax

(D) Na2HPO4

Q.16 Boric acid is very weak acid but in presence of certain organiccompounds, it acts as a strong acid. Which one of the followingorganic compounds can affect such change ?

(A) Glycerol

(B) Acetic acid

(C) Ethyl alcohol

(D) Ethylene


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Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15Ans. A A C A A,B,C,D B B,C,D B A A,B,D C C A A AQue. 16 17 18 19Ans. A C D C

ANSWERS

Q.17 When a nickel salt is heated with boric anhydride, a brown colouredbead is formed which is due to the formation of –

(A) Ni2 B4O7

(B) NiO

(C) Ni (BO2)2

(D) None of the above

Q.18 Statement-1 : In water, orthoboric acid behaves as a weak mono-basicacid.

Statement-2 : In water, orthoboric acid acts as a proton donor. [IIT-2007]

(A) Both S-1 and S-2 are correct and S-2 is correct explanation ofS-1.

(B) Both S-1 and S-2 are correct but S-2 is not correct explanationof S-1.

(C) S-1 is wrong but S-2 is correct.

(D) S-1 is correct but S-2 is wrong.

Q.19 Statement-1 : Boric acid is a tribasic acid.

Statement-2 : Boric acid contains three hydroxyl groups.

(A) Both S-1 and S-2 are correct and S-2 is correct explanationof S-1.





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EXERCISE # 2B (DIBORANE)

Q.1 The correct structural representation of diborane is :(A) [BH2]

+ + [BH4]–

(B) H.B—B.H

H H

H H

(C) H H

H HB B

H

H

(D) H H

H HB=B

Q.2 In B2 H6 –(A) There is a boron-boron bond (B) The structure is similar to that of C2H6(C) The boron atoms are linked through hydrogen bridges(D) All the atoms lie in the same plane

Q.3 In diborane –(A) 4-Bridged hydrogens and two terminal hydrogens are present(B) 2-Bridged hydrogens and four terminal hydrogens are present(C) 3-Bridged and three terminal hydrogens are present(D) None of the above

Q.4 The type of hybridization of boron in diborane is –(A) sp(B) sp2

(C) sp3

(D) sp3 d2

Q.5 Mark the correct statements in the following in diborane (B2H6) –(A) Each B atom undergoes sp3 hybridization(B) There is tetrahedral environment around each B atom(C) Hb ......B......Hb bond angle is 122º(D) There are four hydrogen bridge bonds

Q.6 In diborane, the two H—B—H angles are nearly(A) 60°, 120°(B) 95°, 120°(C) 95°, 150°(D) 120°, 180°

Q.7 Consider the following statements. In diborane1. Boron is approximately sp3 hybridized2. B—H—B angle is 180°3. There are two terminal B—H bonds for each boron atom4. There are only 12 bonding electrons available.

(A) 1,2 and 4 are correct(B) 1,2 and 3 are correct(C) 2,3 and 4 are correct(D) 1,3 and 4 are correct


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Q.8 The two type of bonds present in B2H6 are covalent and ..........

(A) Ionic

(B) Co-ordinate

(C) Hydrogen bridge bond

(D) None

Q.9 Select correct statement about B2H6 :

(A) Bridging groups are electron-deficient with 12 valence elec-trons

(B) It has 2c – 2e B—H—B bonds

(C) It has 3c – 2e B—H—B bonds

(D) All of the above are correct statements

Q.10 Identify the statement that is not correct as far as structure ofdiborane is concerned –

(A) There are two bridging hydrogen atoms and four terminal hy-drogen atoms in diborane

(B) Each boron atom forms four bonds in diborane

(C) The hydrogen atoms are not in the same plane in diborane

(D) All B—H bonds in diborane are similar

Q.11 Which of the following statements is false –

(A) BH3 is not a stable compound

(B) All the B—H bonds in B2H6 are equal

(C) The boron hydrides are readily hydrolysed

(D) Boron hydrides are prepared by the action of dil. HCl on Mg3B2

Q.12 Three centred bond is present in –

(A) NH3

(B) B2H6

(C) BCl3(D) AlCl3

Q.13 Molecule(s) possessing both three-centre-two electron bonds andthree-centre-four electron bonds would include :

(A) B2H6 and SiF4

(B) XeF6 and BF6

(C) B2H6 and XeF6

(D) B2H6 alone

Q.14 Which of the following hydrides is electron deficient –

(A) NaH

(B) CaH2

(C) CH4

(D) B2H6

Q.15 Which one is not a borane ?

(A) B5H9

(B) B5H10

(C) B5H11

(D) B6H10


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Q.16 The product x in the reaction , 6 LiH + 8 BF3 → 6LiBF4 + x is –

(A) B4H10

(B) B2H6

(C) BH3

(D) B3H8

Q.17 Inorganic benzene is :

(A) B3N3H6

(B) B3O3H6

(C) B2H6

(D) (BH3)3

Q.18 Diborane is a Lewis acid forming addition compound B2H6.2NH3 withNH3, a Lewis base. This:

(A) Is ionic and exists as [BH2(NH3)2]+ and [BH4]

– ions

(B) On heating, is converted into borazine, B3N3H6 (called inor-ganic benzene)

(C) Both correct

(D) None correct.

Q.19 Considering the following statements concerning dibroane :

(a) There is free rotation about B—B axis

(b) All the H atoms are bonded to B atoms in a similar way

(c) Its final hydrolysis products are hydrogen and boric acid

(d) It forms addition compounds with ammonia

Which of the statements are correct.

(A) a and b

(B) b and c

(C) c and d

(D) a and d

Q.20 H3BO3 →1T X →2T

Y →red hot B2O3 if T1 < T2 then X and Y

respectively are

(A) X = Metaboric acid Y = Tetraboric acid

(B) X = Tetraboric acid and Y = Metaboric acid

(C) X = Borax and Y = Metaboric acid

(D) X = Tetraboric acid and Y = Borax

Q.21 Which one of the following statements is not true regardingdiborane?

(A) It has two bridging hydrogens and four perpendicular to therest.

(B) When methylated, the product is Me4B2H2.

(C) The bridging hydrogens are in a plane perpendicular to therest.

(D) All the B—H bond distances are equal


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Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15Ans. C C B C A,B,C B D C A,C D B B D D BQue. 16 17 18 19 20 21 22 23Ans. B A C C A D A,B,C A,B,C

ANSWERS

Q.22 When an inorganic compound (X) having 3c-2e as well as 2c-2ebonds reacts with ammonia gas at a certain temperature, gives acompound (Y) iso-structural with benzene. Compound(X) with am-monia at a high temperature, produces a hard substance (Z). Then

(A) (X) is B2H6

(B) (Z) is known as inorganic graphite

(C) (Z) having structure similar to graphite

(D) (Z) having structure similar to (X)

Q.23 Which of the following statements is/are correct regarding B2H6 ?

(A) Banana bonds are longer but stronger than normal B—Hbonds

(B) B2H6 is also known as 3c-2e compound

(C) The hybrid state of B in B2H6 is sp3 while that of sp2 in BH3

(D) It cannot be prepared by reacting BF3 with LiBH3 in thepresence of dry ether


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EXERCISE # 2C (BORON HALIDE)

Q.1 BF3 acts as an acid according to the concept of–

(A) Lewis

(B) Bronsted

(C) Arrhenius

(D) None

Q.2 BF3 is an example of Lewis acid because it behaves as :

(A) Nucleophile

(B) Electrophile

(C) Free radical

(D) Lyophilic

Q.3 Boron halides behave as Lewis acids because they –

(A) Are covalent compounds

(B) Are ionic compounds

(C) Have only six electrons

(D) Have a lone pair of electrons on the B atom

Q.4 Mark the wrong statement regarding BF3 –

(A) It acts as a Lewis acid

(B) It forms addition compound with NH3

(C) It is a volatile liquid at room temperature

(D) It combines with ether to form boron trifluoride etherate

Q.5 BF3 behaves as a :

(A) Lewis acid and lone pair from the Lewis base is filled into empty2pz orbital

(B) Lewis base and lone pair on B is donated to empty orbital ofthe Lewis acid

(C) Amphoteric species due to interaction with acid and base both

(D) Polymeric substance

Q.6 Which one of the following statements regarding BF3 is not correct ?

(A) It is a Lewis acid

(B) It is an ionic compound

(C) It is an electron deficient compound

(D) If forms adducts

Q.7 The shape and hybridization in BF3 are –

(A) Linear , sp2

(B) Planar, sp3 d

(C) Planar, sp2

(D) Planar, sp3

Q.8 BCl3 is planar molecule because in this molecule boron is

(A) sp3-Hybridized

(B) sp2-Hybridized

(C) sp-Hybridized

(D) sp3d-Hybridized


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Q.9 Which one of the following is a gas –(A) BF3

(B) BCl3(C) BBr3

(D) All the above

Q.10 NH3 and BF3 form an adduct readily because they form –

(A) A coordinate bond(B) A hydrogen bond(C) An ionic bond(D) A covalent bond

Q.11 Which of the following statements is false –(A) Boron trifluoride is a strong Lewis base(B) Aluminium is a good reducing agent

(C) Boron resembles in many properties with silicon(D) Boron does not form B3+ ions

Q.12 Boron forms BX3 type of halides. The correct increasing order of Lewis-acid strength of these halides is

(A) BF3 > BCl3 > BBr3 > BI3(B) BI3 > BBr3 > BCl3 > BF3

(C) BF3 > BI3 > BCl3 > BBr3

(D) BF3 > BCl3 >BI3 > BBr3

Q.13 Which one of the following is strongest Lewis acid –(A) BF3

(B) BCl3(C) BBr3

(D) Bl3

Q.14 Which of the following statements is correct –(A) BCl3 and AlCl3 are both Lewis acids and BCl3 is stronger than

AlCl3(B) BCl3 and AlCl3 are both Lewis acids and AlCl3 is stronger than

BCl3(C) BCl3 and AlCl3 are both equally strong-Lewis acids(D) Both BCl3 and AlCl3 are not Lewis acids

Q.15 Fluorine is more electronegative than either boron or phosphorus.What conclusion can be drawn from the fact that BF3 has no dipolemoment but PF3 does –

(A) BF3 is not spherically symmetrical but PF3 is(B) BF3 molecule must be linear(C) The atomic radius of P is larger than that of B

(D) The BF3 molecule must be planar triangular

Q.16 The dipole moments of the given molecules are such that :(A) BF3 > NF3 > NH3

(B) NF3 > BF3 > NH3

(C) NH3 > NF3 > BF3

(D) NH3 > BF3 > NF3


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Q.17 In BF3 :

(A) All the B—F bond are single covalent in nature

(B) Boron-fluorine bond has some double bond character and thisbond is delocalised

(C) Bond energy and bond length of B—F bond indicate its singlebond character

(D) All the bonds are ionic

Q.18 B—F bond order in BF3 is :

(A) 1

(B) 2

(C) 3

(D) 4/3

Q.19 Which of the following compounds are formed when BCl3 is treatedwith water –

(A) H3 BO3 + HCl

(B) B2H6 + HCl

(C) B2O3 + HCl

(D) None

Q.20 BF3 on hydrolysis forms :

(A) H3BO3

(B) HBF4

(C) Both (A) and (B)

(D) None of these

Q.21 Which of the following is the correct prediction about observed B—Xbond length, in BX3 molecule ?

(A) B—F bond length in BF3 is found to be less than theoreticalvalue because the electronegativity values of B(2.04) and F(4.0) suggest the bond to be ionic and hence the attractionbetween oppositely charged ions must decrease the bondlength

(B) BF3 and [BF4]– have equal B—F bond length

(C) The decrease in the B—F bond length in BF3, is due todelocalised pπ-pπ bonding between vacant 2p orbital of B andfilled 2p orbital of F

(D) The correct B—X bond length order is

B—F > B—Cl > B—Br > B—I

Q.22 Which is correct about the hydrolysis of BX3 ?

(A) All BX3 undergo hydrolysis to produce B(OH)3(aq) and HX(aq.)

(B) BF3 does not undergo complete hydrolysis due to formation ofH+ [BF3OH]–

(C) BBr3 does not undergo hydrolysis at all because it can notform H-bonds with water

(D) All of the above are correct


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Q.23 B can be obtained from halide by Van Arkel method. This involvesreaction :

(A) 2BCl3 + 3H2 red hotW or Ta

filament→ 2B + 6HCl

(B) 2BI3 red hotW or Ta→ 2B + 3I2

(C) Both A & B(D) None of the above

Q.24 BCl3 does not exist as dimer but BH3 exist as dimer (B2H6) because(A) Chlorine is more electronegative than hydrogen(B) There is pπ-pπ back bonding in BCl3 but BH3 does not contain

such multiple bonding(C) Large sized chlorine atoms do not fit in between the small

boron atoms whereas small sized hydrogen atoms get fittedbetween boron atoms

(D) None of these

Q.25 The structure of BF3 is(A) Tetrahedral(B) Pyramidal

(C) Planar triangular(D) T-shaped

Q.26 B2Cl4 :(A) Can be formed by passing BCl3 over Hg at low pressure in an

electric discharge(B) Can exist as non-elipsed and planar structure

(C) Decomposes at low temperature(D) Can show all the facts given above

Q.27 Which of the following is electron deficient –(A) NH3

(B) BCl3(C) PCl3(D) None of these

Q.28 BF3 is used as catalyst in several industrial processes due to its :(A) Strong reducing nature(B) Weak reducing action(C) Strong Lewis acid nature(D) Weak Lewis acid character

Q.29 Statement-1 : The bond lengths in BF3 are 1.30 Å and are shorter thanthe sum of the covalent radii.Statement-2 : pπ-pπ interaction exists and all B—F bonds are equiva-lent and based on modern explanation, the double bond is delocalised.



(C) S-1 is wrong but S-2 is correct.(D) S-1 is correct but S-2 is wrong.


Note


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Q.30 Statement-1 : BF3 is a weaker Lewis acid than BCl3.

Statement-2 : BF3 molecule is stabilized to a greater extent than BCl3by B—F π-bonding.





Q.31 Statement-1 : Calculate bond length of B—F bond in BF3 is 152 pmwhereas observed bond length is 130 pm.

Statement-2 : Boron fluoride possesses .......B F (or double bond)

character due to pπ-pπ back bonding.





Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16Ans. A B C C A B C B A A A B D A D CQue. 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31Ans. B D A C C B B C C D B C A A A

ANSWERS


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EXERCISE # 2D (ALUMINIUM)

Q.1 Aluminium belongs to :

(A) s-block elements(B) p-block elements(C) d-block elements(D) f-block elements

Q.2 Aluminium forms :(A) Electrovalent compounds only(B) Covalent compounds only(C) Electrovalent and covalent compounds both(D) Co-ordinate compounds only

Q.3 Which of the following elements is the most electropositive –(A) Al(B) B(C) Ga(D) ln

Q.4 Which one of the following is most abundant in the earth's crust -(A) Al(B) B(C) In(D) Ga

Q.5 Atomic radius of Ga is lesser than that of Al because of :(A) Greater shielding power of s-electrons of Ga atoms(B) Poor shielding power of s-electron of Ga atoms(C) Poor shielding power of d-electrons of Ga atoms(D) Greater shielding power of d-electrons of Ga atoms

Q.6 The first I.P. of Al is smaller than that of Mg because :(A) Atomic size of Al > Mg(B) Al has one electron in p-orbital(C) Atomic sie of Al < Mg(D) Not known

Q.7 Which of the following statements is not true both for B and Al –(A) They burn in oxygen to give oxides at high temperature(B) Their halides are Lewis acids(C) They combine with nitrogen to form nitrides(D) They react with HCl to from chlorides

Q.8 Which of the following statements is not true –(A) Al is ionic in all its compounds(B) Al is a light metal of great tensile strength(C) Al is a powerful reducing agent(D) Al does not react with steam even at high temperature

Q.9 Which of the following statements is incorrect about aluminium –(A) It liberates H2 from acids(B) It liberates H2 from bases(C) It liberates H2 from both acids and bases(D) It liberates H2 from acids but not from bases


Note


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Q.10 Which of the following elements dissolves in NaOH to evolve H2 gas –(A) Thallium(B) Indium(C) Aluminium(D) Magnesium

Q.11 When Al is added to potassium hydroxide solution :(A) No reaction takes place(B) Oxygen is evolved(C) Water is produced(D) Hydrogen is evolved

Q.12 Al reduces most of the metallic oxides due to its greater affinity for:(A) Oxygen(B) Metals(C) Protons(D) None of the above

Q.13 On heating Al at 800º C in air, Al2O3is formed. The reaction is :(A) An endothermic reaction(B) An exothermic reaction(C) Reduction of aluminium(D) None of these

Q.14 Aluminium becomes passive in -(A) Conc. HNO3(B) H2CrO4(C) HClO4(D) All

Q.15 Aluminium becomes passive in nitric acid because(A) It is a noble metal(B) It forms a thin film of oxide(C) Of inert pair effect(D) All of these

Q.16 Al is more reactive than Fe but Al is less easily corroded than Febecause -

(A) It is a noble metal(B) Oxygen forms a protective oxide layer(C) Iron undergoes reaction easily with water(D) Fe form mono and divalent ions.

Q.17 Aluminium metal is corroded in coastal places near to the sea, be-cause protective oxide film:

(A) Is removed by sea water(B) Reacts with sea water(C) Is attacked by salt present in sea water(D) Reacts with sand partiicles

Q.18 Al dissolves in molten NaOH with the formation of :(A) Sodium aluminate (Na3AlO3)(B) Sodium meta-aluminate (NaAlO2)(C) Aluminium hydroxide(D) Alumina


Note


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Q.19 Aluminium reacts with nitrogen to form :

(A) AlN

(B) Al2N3

(C) Al2N

(D) Al4N6

Q.20 Which of the following carbides on treatment with water evolves meth-ane -

(A) CaC2

(B) Al4C3

(C) B4C

(D) SiC

Q.21 Aluminium deposited as vapours on glass forms a good mirror, es-sentially because :

(A) It has better shine than Ag

(B) It does not scratch

(C) Coating is much smoother

(D) It does not tarnish in air

Q.22 Aluminium is not used :

(A) In thermite welding

(B) As oxidiser in metallurgy

(C) For making utensils

(D) In sillvery paints

Q.23 Statement-1 : Al is stable in air and water.

Statement-2 : Al is placed above H in electrochemical series.





Q.24 Statement-1 : Aluminium sulphide gives a foul odour when damp.

Statement-2 : It undergoes hydrolysis to form H2S.





Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15Ans. B C A A C B C A D C D A B D BQue. 16 17 18 19 20 21 22 23 24Ans. B C B A B D B D A

ANSWER KEY


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EXERCISE # 2E (EXTRACTION OF ALUMINIUM)

Q.1 Alumina is insoluble in water because -(A) It is a covalent compound

(B) It has high lattice energy and low heat of hydration(C) It has low lattice energy and high heat of hydration(D) Al3+ and O2– ions are not excessively hydrated

Q.2 Alumina may be converted into anhydrous AlCl3 by -(A) Heating it with conc. HCl(B) Heating it in a current of dry chlorine

(C) Heating it with rock salt(D) Mixing it with carbon and heating the mixture in a current of

dry chlorine.

Q.3 Alumina is ............. in nature :(A) Acidic(B) Basic(C) Amphoteric

(D) Neutral

Q.4 Al(OH)3 reacts with excess of caustic soda to form(A) Aluminium oxide(B) Sodium meta- aluminate(C) Sodium tetra aluminate.(D) None of the above

Q.5 Assertion : Al(OH)3 is amphoteric in nature.Reason : It can not be used as an antacid.

(A) If both (A) & (R) are true and (R) is the correct explanation of(A)

(B) If both (A) and (R) are true but (R) is not correct explanationof (A)

(C) If (A) is true but (R) is false

(D) If (A) is false and (R) is true

Q.6 Which of the following mineral does not contain Al -(A) Cryolite(B) Mica(C) Feldspar(D) Fluorspar

Q.7 Corundum is -(A) Al2(SO4)3

(B) Al2O3. H2O(C) Al2O3. 2H2O(D) Al2O3

Q.8 Aluminium is mainly extracted from :(A) Magnetite

(B) Bauxite(C) Alumina(D) Haematite


Note


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Q.9 Which of the following reactions forms the basis of Goldschmidtaluminothermite process -

(A) 2 Al + N2 → 2 AlN

(B) 2 Al + 3Cl3 → 2 AlCl3(C) 2 Al + 6 HCl → Al2Cl3 + 3 H2

(D) 2 Al + Fe2O3 → Al2O3 + 2Fe

Q.10 Which of the following reactions does not take place -

(A) 4 Al + 3 O2 → 2 Al2 O3

(B) 8 Al + 3 Mn3O4 → 4 Al2O3 + 9 Mn

(C) 2 Al + Fe2O3 → Al2O3 + 2 Fe

(D) Al2O3 + Cr → Cr2O3 + 2Al

Q.11 The thermite process involves the use of -

(A) Al2O3 and Fe

(B) Al2O3 and Fe2O3

(C) Al and Fe2O3

(D) Al, Fe2O3 and Al2O3

Q.12 Thermite is a mixture of -

(A) 3 Parts of powdered Al and 1 part of Fe2O3

(B) 1 Part of powdered Al and 3 parts of Fe2O3

(C) 1 Part of powdered Al and 1 part of Fe2O3

(D) 2 parts of powdered Al and 1 part of Fe2O3

Q.13 Alumina on heating with carbon in nitrogen atmosphere gives :

(A) Al + CO

(B) Al + CO2

(C) AlN + CO

(D) Al + CO + N2

Q.14 In the aluminothermite process, Al acts as a/an -

(A) Flux

(B) Oxidising agent

(C) Reducing agent

(D) Solder

Q.15 Which of the following processes does not involve a catalyst -

(A) Haber's Process

(B) Thermite Process

(C) Ostwald Process

(D) Contact Process

Q.16 Aluminothermy used for on the spot welding of large iron structuresis based upon the fact that -

(A) As compared to iron, aluminium has greater affinity for oxy-gen

(B) As compared to aluminium, iron has greater affinity for oxy-gen

(C) Reaction between aluminium and oxygen is endothermic

(D) Reaction between iron and oxygen is endothermic.


Note


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Q.17 Alumino-thermy is process involving :

(A) Reduction of oxide of metal by heating with sodium

(B) Exothermic reduction of metal oxides by heating with Al

(C) Reduction of oxides of a metal by heating with carbon

(D) None of these

Q.18 Aluminium vessels should not be washed with materials containingwashing soda since -

(A) Washing soda is expensive

(B) Washing soda is easily decomposed

(C) Washing soda reacts with Al to form insoluble aluminium ox-ide.

(D) Washing soda reacts with Al to form soluble aluminate

Q.19 Which one of the following is used to remove silicon dioxide in theSerpeck's process of purification of bauxite ?

(A) CaO

(B) Na2CO3

(C) Coke

(D) Nickel

Q.20 The first step involved in the purification of white bauxite by Serpeck'smethod is

(A) Treatment of bauxite with concentrated solution of causticsoda under pressure at 423 K

(B) Fusion of powdered bauxite with sodium carbonate

(C) Heating of powdered bauxite with coke in a current of nitrogen

(D) None of the above

Q.21 ............ is the by - product obtained in the serpeck's process :(A) Oxygen

(B) Ammonia

(C) Nitrogen dioxide

(D) Nitric oxide

Q.22 The process used for purification of bauxite ore containing high silicacontent as impurity is :

(A) Baeyer's process

(B) Hall's process

(C) Hoope's process

(D) Serpeck's process

Q.23 In Hall's process, the ore is mixed with

(A) Coke

(B) Calciulm carbonate

(C) Sodium hydroxide

(D) Sodium carbonate

Q.24 Purification of aluminium by electrolytic refining is known as

(A) Hall's process

(B) Serpeck's process

(C) Baeyer's process

(D) Hoope's process.


Note


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Q.25 Purification of alumina is essential because :(A) Impure alumina is a very poor conductor of electricity(B) Impure alumina has a very high melting point(C) Impure alumina cannot react with the oxidizing agent(D) It is difficult to purify aluminium metal

Q.26 Aluminium is extracted by the electrolysis of(A) Bauxite(B) Alumina(C) Cryolite(D) Alumina mixed with molten cryolite

Q.27 Electrolytic reduction of pure alumina is not possible because :(A) It is amphoteric(B) It dissociates on fusion(C) It melts at very high tempetrature(D) None of these

Q.28 The cryolite is(A) NaAlO3

(B) Na3AlF6

(C) Na3AlO3

(D) Na2AlF5

Q.29 In the electrolytic extraction of aluminium fused cryolite is added(A) To make a conducting solution of bauxite(B) To act as reducing agent(C) To increase Al production(D) To protect the anodes.

Q.30 Anodised aluminium is :(A) Al obtained at anode(B) Al prepared electrolytically(C) Alloy of Al containing 95 % Al(D) Al electrolytically coated with aluminium oxide

Q.31 On adding ammonium hydroxide solution to Al2(SO4)3 aq :(A) A precipitate is formed which does not dissolve in excess of

ammonium hydroxide(B) A precipitate is formed which dissolves in excess of ammonia

solution(C) No precipitate is formed(D) None of these

Q.32 “Ammonal” used in bombs is a mixture of -(A) Al + Al (NO3)3(B) Al + Al2O3 + B2O3(C) Al + KNO3(D) Al2O3 + C

Q.33 Which of the following compounds can make cloth fire proof -(A) Aluminium sulphate(B) Ferrous sulphate(C) Manganese sulphate(D) Cuprous sulphate


Note


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Q.34 The alumina - silica clay called ‘bentonite’ is dropped from aeroplanesin the slurry form for -

(A) Fertilizing the soil

(B) Spreading water over fires

(C) Cooling the soil

(D) Fulmigation.

Q.35 In aluminates, the coordination number of Al is -

(A) 4

(B) 6

(C) 3

(D) 1

Q.36 Statement-1 :- Al is obtained from bauxite ore by Serpeck's process

Statement-2:- This process is used when silica is present as impurityin bauxite ore

(A) Statement-1 is true, Statement-2 is true; statement 2 is acorrect explanation for statement-1.

(B) Statement-1 is true, Statement 2 is True; Statement 2 isNOT a correct explanation for Statement-1.

(C) Statement-1 is true, Statement-2 is false.

(D) Statement-1 is false, Statement-2 is True.

Q.37 Statement-1 : During extraction of Al from Al2O3 a little cryolite isadded to Al2O3.

Statement-2 : Alumina has high m.pt. addition of cryolite lowers themelting point as well as increases the conductance offused mass.

(A) Statement-1 is true, Statement-2 is true; statement 2 is a correct explana-tion for statement-1.

(B) Statement-1 is true, Statement 2 is True; Statement 2 is NOT a correctexplanation for Statement-1.



Q.38 Statement-1 : Molten AlBr3 is poor conductor of current.

Statement-2 : AlBr3 being ionic in nature provides Al3+ and Br– ions.

(A) Statement-1 is true, Statement-2 is true; statement 2 is acorrect explanation for statement-1.

(B) Statement-1 is true, Statement 2 is True; Statement 2 isNOT a correct explanation for Statement-1.



Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15Ans. B D C B C D D B D D C B C C BQue. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30Ans. A B D C C B D D D D D C B A DQue. 31 32 33 34 35 36 37 38Ans. A A A B B D A C

ANSWER KEY


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EXERCISE # 2F (ALUMINIUM CHLORIDE))

Q.1 AlCl3 is -

(A) Anhydrous and covalent

(B) Anhydrous and ionic

(C) Covalent and basic

(D) Coordinate and acidic

Q.2 Aluminium chloride is a/an -

(A) bronsted-Lowry acid

(B) Arrhenius acid

(C) Lewis acid

(D) Lewis base

Q.3 Which one is a covalent compound -

(A) Al2(SO4)3

(B) AlCl3(C) AlF3

(D) Al2O3

Q.4 Which of the following is a Lewis acid -

(A) PCl3(B) AlCl3(C) NCl3(D) AsCl3

Q.5 Which of the following is not a Lewis acid -

(A) AlCl3(B) SnCl4(C) FeCl3(D) AlCl3. 6 H2O

Q.6 Which 13th group M3+ ion can exist in aq. state but the same is notfound in solid state.

(A) Al3+

(B) Tl3+

(C) Ga3+

(D) B3+

Q.7 Identify incorrect statement about AlCl3(A) Its a covalent solid

(B) It dimerises in vapour phase

(C) In aq. solution it shows ionic properties

(D) All of above are incorrect.

Q.8 Anhydrous AlCl3 is prepared from -

(A) Conc. HCl and Al metal

(B) Aluminium and Cl2(C) Dry HCl gas + heated Al metal

(D) Dil. HCl and Al metal


Note


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Q.9 Which of the statements about anhydrous AlCl3 is correct -

(A) It exists as AlCl3 molecule

(B) It is not easily hydrolysed

(C) It sublimes at 100ºC under vacuum

(D) It is a strong Lewis base

Q.10 Hydrated aluminium chloride is ionic and soluble in water giving -

(A) Al3+ and Cl¯ ions

(B) [Al(H2O)6]3+ and Cl¯ ions

(C) [AlCl2(H2O)4]+ and [AlCl4 (H2O)2]¯ ions

(D) None of these

Q.11 AlCl3 on hydrolysis gives -

(A) Al2O3. H2O

(B) Al(OH)3

(C) Al2O3

(D) AlCl3. 6H2O

Q.12 The molecules of aluminium chloride in vapour state :

(A) Have no shape

(B) Are shaped like a plane triangle

(C) Are round

(D) Are like randomly broken bricks

Q.13 In Al2Cl6, which statement is incorrect :

(A) Four Al—Cl bonds are of same length and two of differentlength

(B) Six Al—Cl bonds are of same length and two of different length

(C) The angle Cl—Al—Cl is 110º and 93º

(D) The angle Al—Cl—Al is 87º

Q.14 Anhydrous AlCl3 fumes in air because of –

(A) Dehydration

(B) Hydration

(C) Hydrolysis

(D) Reduction

Q.15 AlCl3 fumes in moist air because

(A) It is very volatile

(B) It is covalent

(C) HCl is formed in moist air

(D) It is highly hygrosopic.

Q.16 Which of the following sublimes on heating -

(A) AlF3

(B) AlCl3(C) AlBr3

(D) All


Note


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Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15Ans. A C B B D A D C C C B B A C CQue. 16 17 18Ans. B D A

ANSWER KEY

Q.17 The reaction between LiH and AlCl3 gives -

(A) Li

(B) AlH3

(C) LiCl3(D) LiAlH4 + 3 LiCl

Q.18 Which of the following methods cannot be used for the preparation ofanhydrous aluminium chloride -

(A) Heating AlCl3. 6H2O

(B) Heating a mixture of alumina and coke in a current of drychlorine

(C) Passing dry HCl gas over heated aluminium powder

(D) Passing dry chlorine over heated aluminium


Note


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EXERCISE # 2G (ALUM)

Q.1 All alums contain :(A) One monovalent and one trivalent metal(B) Both monovalent metals

(C) One divalent and one monovalent metal

(D) Both divalent metals

Q.2 Alum does not have

(A) Li+

(B) NH+

4

(C) K+

(D) Al+3

Q.3 Potash alum is water soluble and ionises in aqueous solution to give:

(A) One type of ions

(B) Two types of ions

(C) Three types of ions

(D) Four types of ions

Q.4 Which alum is not having same structure with other given alums.

(A) FeSO4 Al2 (SO4)3. 24H2O

(B) Na2SO4. Al2(SO4)3. 24H2O

(C) (NH4)2SO4.Fe2(SO4)3.24H2O

(D) All have same structure.

Q.5 The aqueous solution of potash alum is

(A) Basic

(B) Acidic

(C) Neutral

(D) None of these

Q.6 When a solution of sodium hydroxide is added in excess to the solutionof potash alum, we obtain :

(A) A white precipitate

(B) Bluish white precipitate

(C) A clear solution

(D) A crystalline mass

Q.7 Which of the following is known as pseudo-alum ?

(A) KMn(SO4)2. 12H2O

(B) KCr (SO4)2.12H2O

(C) NH4Fe(SO4)2.12H2O

(D) FeSO4.Al2(SO4)3.24H2O

Que. 1 2 3 4 5 6 7Ans. A A C A B C D

ANSWER KEY

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IIT JEE -2013 coordination chemistry "BORON- FAMILY"