Question Set D

cbse 12th Standard Chemistry Coordination Compounds Important Questions And Answers Study Material - QB365

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Questions:

Multiple Choice Question

60 x 1 = 60

The magnetic moment of [NiCl₄]^2-

(a)

1.82 BM

(b)

2.82 BM

(c)

4.42 BM

(d)

5.46 BM

Which of the following complexes is a 'Chelate' complex?

(a)

[CO(NH₃)₆]³⁺

(b)

[Co(en)₃]³⁺

(c)

[Co(NH₃)₄ Cl₂]

(d)

[CoF₆]³⁺

CO is stronger ligand than Cl^- because

(a)

CO is neutral molecule

(b)

CO has \(\pi\)-bond

(c)

CO is poisonous

(d)

CO is more reactive

Chlorophyll is complex of

(a)

(b)

(c)

(d)

The molecular formula of Wilkinson catalyst, used in hydrogenation of alkenes is

(a)

[Co(Co)₆]

(b)

[(Ph₃P)₃Rh]Cl

(c)

[Pt(NH₃)₂Cl₂]

(d)

K[Ag(CN)₂]

Which one will show optical isomerism?

(a)

[Co(NH₃)₃Cl₃]

(b)

cis-[Co(en)₂ Cl₂] Cl

(c)

trans-[Co(en)₂ Cl₂] Cl

(d)

[Co(NH₃)₄ Cl₂] Cl

Facial and meridional isomerism will be shown by

(a)

[Co(NH₃)₃Cl₃

(b)

[Co(NH₃)₄Cl₂] Cl

(c)

[Co(en)₃] Cl

(d)

[Co(NH₃)₅Cl] Cl₂

Correct increasing order of wavelength of absorption in visible region for cornplex of Co³⁺ is

(a)

\( {\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+},\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+},\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}} \)

(b)

\({\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+},\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+},\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}} \)

(c)

\({\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+},\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}} \)

(d)

\({\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+},\left[\mathrm{Co}\left(\mathrm{NH}_{6}\right)_{6}\right]^{3+},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}} \)

The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with complexes: CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃ respectively is

(a)

3AgCl, 1AgCl, 2AgCl

(b)

3AgCl, 2AgCl, 1AgCl

(c)

2AgCl, 3AgCl, 2AgCl

(d)

1AgCl, 3AgCl, 2AgCl

10.

The sum of coordination number of oxidation number of the metal M in the complex [M(en)₂ C₂O₄l Cl are

(a)

(b)

(c)

(d)

11.

Among the ligands NH₃ en, CN^- and CO, the correct order of their increasing field strength, is

(a)

CO < NH₃ < en < CN^-

(b)

NH₃ < en < CN^-< CO

(c)

CN^- < NH₃ < CO < en

(d)

en < CN^-< NH₃ < CO

12.

A magnetic moment of 1.73 BM will be shown by one among the following.

(a)

[Cu(NH₃ )₄]²⁺

(b)

[Ni(CN)₄]^2-

(c)

TiCI₄

(d)

[CoCI₆]^4-

13.

Square planar structure is

(a)

[Ni(CO)₄]

(b)

[NiCI₄]^2-

(c)

[Ni(CN)₄]^2-

(d)

None of these

14.

In photography, the use of Na₂S₂O₃.5H₂O is

(a)

for converting AgBr into Ag₂SO₄

(b)

for converting AgBr into soluble thiosulphate complex

(c)

for converting AgBr into silver thiosulphate

(d)

in reduction of Ag metal from AgBr

15.

Hardness of water is estimated by simple titration with Na₂ - EDTA because

(a)

Ca²⁺ ions form stable complexes with EDTA

(b)

Mg²⁺ ions form stable complexes with EDTA

(c)

Ca²⁺ions form unstable complexes with EDTA

(d)

Both (a) and (b)

16.

Colourless complex ion in the following is

(a)

[CU(NH₃)₄]²⁺

(b)

[Zn(NH₃)₄]²⁺

(c)

[Fe(H₂O)₆]³⁺

(d)

[Fe(CN)_6]^3-

17.

In [Fe(CN)₆]^4- and [Fe(CN)₆]^3- number of unpaired electrons is, respectively

(a)

4,5

(b)

0,1

(c)

5,4

(d)

1,2

18.

Which of the following complexes show linkage isomerism ?

(a)

\([Co(NH_3)_5(NO_2)]^{2+}\)

(b)

\([Co(H_2O)_5CO]^{3+}\)

(c)

\([Cr(NH_3)_5SCN]^{2+}\)

(d)

\([Fe(en)_2Cl_2]^+\)

19.

An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HCl. This is because............... .

(a)

\([Co(H_2O)_6]^{2+}\) is transformed into \([CoCl_6]^{4-}\)

(b)

\([Co(H_2O)_6]^{2+}\) is transformed into \([CoCl_2]^{2-}\)

(c)

tetrahedral complexes have smaller crystal field splitting than octahedral complexes.

(d)

tetrahedral complexes have larger crystal field splitting than octahedral complex.

20.

The CFSE for octahedral [CoCl₆]^4- is 18,000 cm^-1. The CFSE for tetrahedral [CoCl₄]^2- will be

(a)

18,000 cm^-1

(b)

16,000 cm^-1

(c)

8,000 cm^-1

(d)

20,000 cm^-1

21.

When 1 mol CrCl₃.6H₂O is treated with excess of AgNO₃, 3 mol of AgCl are obtained. The formula of the complex is

(a)

[CrCl₃(H₂O)₃].3H₂O

(b)

[CrCl₂(H₂O)₄]Cl.2H₂O

(c)

[CrCl(H₂O)₅]Cl₂.H₂O

(d)

[Cr(H₂O)₆Cl₃

22.

Optical isomerism is exhibited by (ox = oxalateanion, en = ethylene diamine)

(a)

cis-[CrCl₂(ox)₂]^3-

(b)

[Co(en)₃]³⁺

(c)

trans-[CrCl₂(ox)₂]^3-

(d)

[Co(ox)(en)₂]⁺

23.

Which of the following are \(\pi\) - bonded organometallic compounds?

(a)

Zeise's salt

(b)

Furacene

(c)

Dibenzene chromium

(d)

Grignard reagent

24.

Which of the following complexes formed by Cu²⁺ ions is most stable

(a)

\({ Cu }^{ 2+ }+4{ NH }_{ 3 }\rightleftharpoons \left[ Cu\left( { NH }_{ 3 } \right) _{ 4 } \right] ^{ 2+ },\quad log\quad K=11.6\)

(b)

\({ Cu }^{ 2+ }+4{ CN }^{ - }\rightleftharpoons \left[ Cu\left( CN \right) _{ 4 } \right] ^{ 2- },\quad log\quad K=27.3\)

(c)

\({ Cu }^{ 2+ }+2en\rightleftharpoons \left[ Cu\left( en \right) _{ 2 } \right] ^{ 2+ },\quad log\quad K=15.4\)

(d)

\({ Cu }^{ 2+ }+2{ H }_{ 2 }O\rightleftharpoons \left[ Cu\left( { H }_{ 2 }O \right) _{ 4 } \right] ^{ 2+ },\quad log\quad K=8.9\)

25.

The compound K₃[Co(ONO)₆] is called

(a)

potassium cobaltinitrite

(b)

Fischer's salt

(c)

potassium hexanitritocobaltate (III)

(d)

potassium cobalt nitrate

26.

The compound Na₂[Fe(CN)₅NO] is called

(a)

sodium nitroprusside

(b)

sodium pentacyanonitrosonium ferrate (II)

(c)

sodium pentacyanonitrosylferrate (III)

(d)

sodium nitrosoferrocyanide

27.

The equation which is balanced and represents the correct product(s) is

(a)

CuSO₄ + 4 KCN \(\rightarrow \) K₂[Cu(CN)₄] + K₂SO₄

(b)

Li₂O + 2 KCl \(\rightarrow \) 2 LiCl + K₂O

(c)

[CoCl(NH₃)₅]⁺ + 5H⁺ \(\rightarrow \) Co²⁺+ 5 \({ NH }_{ 4 }^{ + }\) + Cl^-

(d)

[Mg(H₂O)₆]²⁺ + (EDTA)^4- \(\overset { excess\quad NaOH }{ \rightarrow } \) [Mg(EDTA)]²⁺ + 6 H₂O

28.

Copper sulphate dissolves in excess of KCN to give

(a)

[Cu(CN)₄]^2-

(b)

Cu(CN)₂

(c)

CuCN

(d)

[Cu(CN)₄]^3-

29.

Which of the following complexes is used as an anti-cancer agent?

(a)

mer-[Co(NH₃)₃Cl₃]

(b)

cis-[PtCl₂(NH₃)₂]

(c)

cis-K₂[PtCl₂Br₂]

(d)

Na₂CoCl₄

30.

Dipole moment will be zero in the complexes
I. [Ni(CN)₄]^2-
II. cis-Pt[(NH₃)₂Cl₂]
III. trans-[Pt(NH₃)₂Cl₂]

(a)

I and II

(b)

I and III

(c)

II and III

(d)

I, II and III

31.

How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca²⁺ ion?

(a)

One

(b)

Two

(c)

Six

(d)

Three

32.

In Fe(CO)₅, the Fe \(\leftarrow \) CO \(\sigma \) bond results by the overlap between filled sp hybrid orbital of C - atom of CO molecule and vacant

(a)

d²sp²

(b)

sp³

(c)

dsp³

(d)

dsp² hybrid orbital of Fe

33.

Among the following metal carbonyls, the C-O bond order is lowest in

(a)

[Mn(CO)₆]⁺

(b)

[Fe(CO)₅]

(c)

[Cr(CO)₆]

(d)

[V(CO)₆]^-

34.

Consider the following complexes:
1. Fe(CO)₅
2. Ni(CO)₄
3. K₄[Fe(CN)₆]
4. Na₃[Cu(SCN)₄]
Which of the above complexes obey EAN rule?

(a)

1 and 2 only

(b)

2, 3 and 4 only

(c)

1, 2, 3 and 4

(d)

none of the above

35.

The ratio of the uncomplexed to the complexed Zn²⁺ ion in a solution of 10 M NH₃ is (Given that the stability constant of [Zn(NH₃)₄]²⁺ is \(3\times10^9\))

(a)

\(3.3\times10^{-9}\)

(b)

\(3.3\times10^{-11}\)

(c)

\(3.3\times10^{-13}\)

(d)

\(3.3\times10^{-14}\)

36.

[Cr(H₂O)₆]Cl₃ (at.no. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is

(a)

\({ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ xz }^{ 1 }\)

(b)

\({ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ z ^2}^{ 1 }\)

(c)

\({ 3d }_{ (x^2-y^2)}^{ 1 },{ 3d }_{ z^2 }^{ 1 },{ 3d }_{ xz }^{ 1 }\)

(d)

\({ 3d }_{ xy}^{ 1 },{ 3d }_{ (x^2-y^2) }^{ 1 },{ 3d }_{ yz }^{ 1 }\)

37.

Coordination number of Cr is six. A complex ion of Cr with \({ C }_{ 2 }{ O }_{ 4 }^{ 2- }\)_, en and superoxide ion \({ O }_{ 2 }^{ - }\) has the formula [Cr(C₂O₄)_x (en)_y (O₂)_z]^-. The ratio x : y : z will be

(a)

1 : 1 : 1

(b)

1 : 1 : 2

(c)

1 : 2 : 2

(d)

2 : 1 : 1

38.

Which of the following complex has minimum magnitude of \({ \Delta }_{ 0 }\)?

(a)

[Cr(CN)₆]^3-

(b)

[Co(NH₃)₆]³⁺

(c)

[CoCl₆]^3-

(d)

[Cr(H₂O)₆]³⁺

39.

Which of the following facts about the complex [Cr(NH₃)₆]Cl₃ is wrong?

(a)

The complex is paramagnetic

(b)

The complex is an outer orbital complex

(c)

The complex gives white precipitate with silver nitrate solution

(d)

The complex involves d²sp³ hybridization and is octahedral in shape.

40.

Geometrical shapes of the complexes formed by the reaction of Ni²⁺ with Cl^-, CN^- and H₂O_,respectively, are

(a)

Octahedral, tetrahedral and square planar

(b)

Tetrahedral, square planar and octahedral

(c)

Square planar, tetrahedral and octahedral

(d)

Octahedral, square planar and tetrahedral

41.

Which one of the following is wrongly matched?

(a)

[Cu(NH₃)₄]²⁺ - square planar

(b)

[Ni(CO)₄] - neutral ligand

(c)

[Fe(CN)₆]^3- - sp³d²

(d)

[Co(en)₃]³⁺ - follows EAN rule

42.

Which of the following complexes are not correctly matched with the hybridisation of their central metal ion?
(i) [Ni(CO)₄]sp³
(ii) [Ni(CN)₄]^2-sp³
(iii) [CoF₆]^3-d²sp³
(iv) [Fe(CN)₆]^3-sp³d²
select the correct answer using answer using the codes given below:

(a)

(i) and (ii)

(b)

(i) and (iii)

(c)

(ii) and (iv)

(d)

(i), (iii) and (iv)

(e)

(ii), (iii) and (iv)

43.

Amongst Ni(CO)₄, [Ni(CN)₄]^2-and [NiCl₄]^2-

(a)

Ni(CO)₄and [NiCl₄]^2- are diamagnetic and [Ni(CN)₄]^2-is paramagnetic

(b)

[NiCl₄]^2- and [Ni(CN)₄]^2- are diamagnetic and Ni(CO)₄is paramagnetic

(c)

Ni(CO)₄and [Ni(CN)₄]^2- are diamagnetic and [NiCl₄]^2-is paramagnetic

(d)

Ni(CO)₄is diamagnetic and [NiCl₄]^2-and [Ni(CN)₄]^2-are paramagnetic

44.

Both Co³⁺ and Pt⁴⁺ have a coordination number of six. Which of the following pair of complexes will show approximately the same electrical conductance for their 0.001 M aqueous solutions?

(a)

CoCl₃.4NH₃ and PtCl₄.4 NH₃

(b)

CoCl₃.3NH₃ and PtCl₄.5 NH₃

(c)

CoCl₃.6NH₃ and PtCl₄.5 NH₃

(d)

CoCl₃.5NH₃ and PtCl₄.6NH₃

45.

An excess of AgNO₃ is added to 100 mL of 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitated would be :

(a)

0.001

(b)

0.002

(c)

0.003

(d)

0.01

46.

Which of the following complex species is not expected to exhibit optical isomerism?

(a)

[Co(en)(NH₃)₂Cl₂]⁺

(b)

[Co(en)₃]³⁺

(c)

[Co(en)₂Cl₂]⁺

(d)

[Co(NH₃)₃Cl₃]

47.

Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be : (en=ethylenediamine)

(a)

(b)

(c)

(d)

48.

The total number of possible isomers for the complex compound [Cu^II(NH₃)₄][Pt^IICl₄] are

(a)

(b)

(c)

(d)

49.

The name of the complex ion, [Fe(CN)₆]^3- is:

(a)

tricyanoferrate (III) ion

(b)

hexacyanidoferrate (III) ion

(c)

hexacyano iron (III) ion

(d)

hexacyanitroferrate (III) ion

50.

Oxidation number and coordination number of silver in Tollen's reagent respectively are

(a)

1, 1

(b)

2, 1

(c)

2, 2

(d)

1, 2

51.

2 : 4 Dinitrophenyl hydrazine is an example for

(a)

Tridentate ligend

(b)

Monodentate ligand

(c)

Polydentate ligand

(d)

Didentate ligand

52.

Which of the following is not considered as an organometallic compound?

(a)

cis-platin

(b)

ferrocene

(c)

Zeise's salt

(d)

Grignard reagent

53.

The oxidation state of nickel in [Ni(CO)₄] is

(a)

(b)

(c)

(d)

54.

Prussian blue is obtained by mixing together aqueous solution of Fe³⁺ salt with

(a)

Ferricyanide

(b)

Ferocyanide

(c)

Hydrogen cyanide

(d)

Sodium cyanide

55.

The dark blue colour of the solution formed when excess of ammonia is added to a solution of copper (II) sulphate is due to the presence of the ion

(a)

[Cu(OH)₄ (H₂O)₂]^2-

(b)

[Cu(H₂O)₆]²⁺

(c)

[Cu(NH₃)₂ (H₂O)₄]²⁺

(d)

[Cu(NH₃)₄ (H₂O)₂]²⁺

56.

The most stable complex among the following is

(a)

K₃[Al(C₂O₄)₃]

(b)

[Pt(en)₂] Cl₂

(c)

[Ag(NH₃)₂] Cl

(d)

K₂[Ni(EDTA)]

57.

The increasing order of the crystal field splitting power of some common ligands is

(a)

H₂O < OH^- < Cl^- < F^- < CN^-

(b)

CN^- < H₂O < OH^- < F^- < Cl^-

(c)

F^- < CN^- < OH^- < Cl^- < H₂O

(d)

Cl^- < F^- < OH^-< H₂O < CN^-

58.

Which of the following is an outer orbital complex?

(a)

[Fe(CN)₆]⁴^-

(b)

[FeF₆]^3-

(c)

[Co(NH₃)₆]³⁺

(d)

[Co(CN)₆]²⁺

59.

The ionization isomer of [Cr(H₂O)₄Cl(NO₂)]Cl is

(a)

[Cr(H₂O)₄ (O₂N)] Cl₂

(b)

[Cr(H₂O)₄Cl₂] (NO₂)

(c)

[Cr(H₂O)₄Cl(ONO)] Cl

(d)

Cr(H₂O)₄Cl₂(NO₂)] H₂O

60.

The number of possible isomers for the complex [Co(C₂O₄)₂(NH₃)₂] is

(a)

(b)

(c)

(d)

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Answers Key:

Multiple Choice Question

60 x 1 = 60

(b)
2.82 BM

(b)
[Co(en)₃]³⁺

(b)
CO has \(\pi\)-bond

(b)
Mg

(b)
[(Ph₃P)₃Rh]Cl

(b)
cis-[Co(en)₂ Cl₂] Cl

(a)
[Co(NH₃)₃Cl₃

(d)
\({\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+},\left[\mathrm{Co}\left(\mathrm{NH}_{6}\right)_{6}\right]^{3+},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}} \)

(b)
3AgCl, 2AgCl, 1AgCl

10.

11.

(b)
NH₃ < en < CN^-< CO

12.

(a)
[Cu(NH₃ )₄]²⁺

13.

14.

(b)
for converting AgBr into soluble thiosulphate complex

15.

(d)
Both (a) and (b)

16.

(b)
[Zn(NH₃)₄]²⁺

17.

(b)
0,1

18.

(a)
\([Co(NH_3)_5(NO_2)]^{2+}\)

19.

(b)
\([Co(H_2O)_6]^{2+}\) is transformed into \([CoCl_2]^{2-}\)

20.

21.

(d)
[Cr(H₂O)₆Cl₃

22.

(a)
cis-[CrCl₂(ox)₂]^3-

23.

(a)
Zeise's salt

24.

(b)
\({ Cu }^{ 2+ }+4{ CN }^{ - }\rightleftharpoons \left[ Cu\left( CN \right) _{ 4 } \right] ^{ 2- },\quad log\quad K=27.3\)

25.

(a)
potassium cobaltinitrite

26.

(a)
sodium nitroprusside

27.

28.

(d)
[Cu(CN)₄]^3-

29.

(b)
cis-[PtCl₂(NH₃)₂]

30.

(b)
I and III

31.

(a)
One

32.

33.

(d)
[V(CO)₆]^-

34.

35.

(d)
\(3.3\times10^{-14}\)

36.

(a)
\({ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ xz }^{ 1 }\)

37.

(b)
1 : 1 : 2

38.

39.

(b)
The complex is an outer orbital complex

40.

(b)
Tetrahedral, square planar and octahedral

41.

42.

(e)
(ii), (iii) and (iv)

43.

44.

45.

(a)
0.001

46.

(d)
[Co(NH₃)₃Cl₃]

47.

(a)
3

48.

(d)
4

49.

(b)
hexacyanidoferrate (III) ion

50.

(d)
1, 2

51.

(b)
Monodentate ligand

52.

(b)
ferrocene

53.

(b)
0

54.

(b)
Ferocyanide

55.

(d)
[Cu(NH₃)₄ (H₂O)₂]²⁺

56.

(d)
K₂[Ni(EDTA)]

57.

(d)
Cl^- < F^- < OH^-< H₂O < CN^-

58.

(b)
[FeF₆]^3-

59.

(b)
[Cr(H₂O)₄Cl₂] (NO₂)

60.

(d)
4

cbse 12th Standard Chemistry Coordination Compounds Important Questions And Answers Study Material - QB365 Set D

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Std: 12th Standard CBSE - Chemistry

chapter: Coordination Compounds - Important Questions And Answers

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Answers Key:

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