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Coordination Compounds

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Q 1. Test tube {tex} \mathrm {I} {/tex} contains (aq) {tex} \mathrm {KI} {/tex}, {tex} \mathrm {II} {/tex} contains (aq) {tex} \mathrm {HgCl}_{2}{/tex}, {tex} \mathrm {III} {/tex} contains mixture of {tex} \mathrm {II} {/tex} and {tex} \mathrm {II} {/tex} in {tex} \mathrm {4:1} {/tex} ratio, Select the correct statement

A

{tex} \mathrm {I} {/tex} and {tex} \mathrm {III} {/tex} give test for {tex} \mathrm I ^ { - } {/tex} and {tex} \mathrm K ^ { + } {/tex}

B

{tex} \mathrm {II} {/tex} and {tex} \mathrm {III} {/tex} both give test for {tex} \mathrm { Hg } ^ { 2 + } {/tex}

C

Both (a) and (b) are correct

None of the above is correct

Explanation

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Q 2. The number of unpaired electrons expected for the complex ion {tex} \left[ \mathrm { Cr } \left( \mathrm { NH } _ { 3 } \right) _ { 6 } \right] ^ { 2+ } {/tex}

2

B

3

C

4

D

5

Explanation

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Q 3. Consider the following complexes:
{tex} \mathrm { I }. \ \mathrm { K } _ { 2 } \mathrm { PtCl } _ { 6 } {/tex}
{tex}\mathrm { II}. \ \mathrm{PtCl } _ { 4 } \cdot 2 \mathrm { NH } _ { 3 } {/tex}
{tex}\mathrm { III }.\ \mathrm { PtCl} _ { 4 } \cdot 3 \mathrm { NH } _ { 3 } {/tex}
{tex}\mathrm { IV }.\ \mathrm { PtCl } _ { 4 } \cdot 5 \mathrm { NH } _ { 3 } {/tex}
Their electrical conductances in aqueous solutions are

{tex} 256,0,97,404 {/tex}

B

{tex} 404,0,97,256 {/tex}

C

{tex} 256,97,0,404 {/tex}

D

{tex} 404,97,256,0 {/tex}

Explanation

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Q 4.

Oxidation number of Cr in the following complex is

3

B

6

C

4

D

5

Explanation

Thus,

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Q 5.

What type of isomerism is present in the pair of complexes and

A

Linkage isomerism

B

Ligand isomerism

Ionisation isomerism

D

Coordination isomerism

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Q 6.

Test tube I contains (aq) KI, II contains ,III contains mixture of I and II in 4:1 ratio, Select the correct statement

A

I and III give test for and

B

II and III both give test for

C

Both (a) and (b) are correct

None of the above is correct

Explanation

I gives test of and

II gives test of and

III gives testing of and

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Q 7.

The number of unpaired electrons expected for the complex ion

2

B

3

C

4

D

5

Explanation

is a strong ligand thus, by (CFSE),

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Q 8.

Isomerisms exhibited by are

A

Ionisation, optical

B

Hydrate, optical

Eometrical, optical

D

Coordinate, geometrical

Explanation

Enatiomer are non-superimposable

Thus, geometrical and optical isomer

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Q 9.

The complex showing a spin-only magnetic moment of 2.82 BM is

A

C

D

Explanation

Since, Cl is a weak field ligand, it doesn’t cause paring of electron.











Number of unpaired electrons, n=2

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Q 10.

The complex showing a spin-only magnetic moment of 2.82 BM is

A

C

D

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Q 11.

Consider the following complex, ions, and , and

The correct order of the complex ions, according to their spin-only magnetic moment values (in BM) is

A

C

D

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Q 12.

and have similarity but not in

A

Magnetic moment

B

C.N. and O.N

C

Structure

Both (a) and (c)

Explanation

square planar diamagnetic

tetrahedral paramagnetic

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Q 13.

Consider the following statements in respect of complex ion

I. It is paramagnate

II. It is low-spin complex

III. Oxidation number of cobalt is

IV. The coordination number of cobalt is 6

Select the correct statement

A

All of the above

B

III and IV only

I and IV only

D

I and II only

Explanation

Oxidation number of cobalt = +2

CN of cobalt = 6

Hence, no pairing

It is thus paramagnetic and high spin complex

Thus, (I) and (IV) are correct

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Q 14.

have

A

hybridised Ni in both cases

B

and hybridised Ni

hybridised Ni

D

in both cases

Explanation

square planar

tetrahedral

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Q 15.

The complex

Can be formally formed from by which one of the following sequences of substitution of the chloride ions?

A

B

C

Explanation

Ligand strength is in order

Thus, replacement of ligands by above ligands is in same order

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Q 16.

Consider the following complexes:

I. II. III. IV.

Their electrical conductances in aqueous solutions are

256,0,97,404

B

404,0,97,256

C

256,97,0,404

D

404,97,256,0

Explanation

(a)

(b) no ionization

One molecule

(c)

(d)

Conductance number of ions

Maximum conductance is of (d) and least that of (b)

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Q 17.

Of the following complex ions, the one that probably has the largest overall formation constant, , is

A

B

C

Explanation

is most stable due to chelate formation

Thus, highest value

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Q 18.

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

A

C

D

Explanation

It does not lack symmetry

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Q 19.

The ions or molecules attached to the central metal atom or ion in a complex are called

Ligands

B

Chelates

C

Ambident

D

Lewis acid

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Q 20.

and will differ in

Colour

B

Structure

C

Hybridisation

D

magnetic moment

Explanation

Due to different n linkage, of (metal linked to Co) and ONO (metal linked to Co) they differ in colour

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Q 21.

Potassium diamminedicyanosulphatosuperoxo palatinate (IV) is

B

C

D

Explanation

Anion is

+4 +0

Cation is

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Q 22.

Arrange the following in order of decreasing number of unpaired electrons

I. II.

III. IV.

IV, I, II, III

B

I, II, III, IV

C

III, II, I, IV

D

II, III, I, IV

Explanation

Complex ligand Unpaired

Electrons

I. weak 4

II. strong 1

III. strong 0

IV. weak 5

Thus,

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Q 23.

Among the following metal carbonyls, bond order is lowest in

A

C

D

Explanation

  • .

  • Three lone pair of back bonding with vacant orbital of C in CO.



  • .

  • Four lone pair for back bonding with CO.



  • Three lone pair for back bonding with CO.



  • .

  • Three lone pair for back bonding with CO.

    Maximum back bonding in , therefore CO bond order is lowest here.

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    Q 24.

    Of the following complex ions, one exhibits optical isomerism, That one is

    B

    C

    D

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    Q 25.

    In spectrochemical series chlorine is above than water i.e., , this is due to

    A

    Good -acceptor properties of Cl

    Strong donor and good -acceptor properties of Cl

    C

    Good donor properties of Cl

    D

    Larger size of Cl than

    Explanation

    When ligands are arranged in ascending order of crystal field splitting energy, , they produce a spectrochemical series.

    In comparison to is strong -donor and good -acceptor, therefore it is a strong ligand than . Hence, in the spectrochemical series Cl is above than water.