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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

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

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

Both (a) and (b) are correct

None of the above is correct

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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

3

4

5

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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}

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

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

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

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Q 4.

Oxidation number of Cr in the following complex is

3

6

4

5

Thus,

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Q 5.

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

Linkage isomerism

Ligand isomerism

Ionisation isomerism

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

I and III give test for and

II and III both give test for

Both (a) and (b) are correct

None of the above is correct

I gives test of

II gives test of

III gives testing of

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Q 7.

The number of unpaired electrons expected for the complex ion

2

3

4

5

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Q 8.

Isomerisms exhibited by

Ionisation, optical

Hydrate, optical

Eometrical, optical

Coordinate, geometrical

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

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

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Q 11.

Consider the following complex, ions,

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

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Q 12.

Magnetic moment

C.N. and O.N

Structure

Both (a) and (c)

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Q 13.

Consider the following statements in respect of

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

All of the above

III and IV only

I and IV only

I and II only

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.

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Q 15.

The complex

Can be formally formed from

Ligand strength is in order

Thus, replacement of

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Q 16.

Consider the following complexes:

I.

Their electrical conductances in aqueous solutions are

256,0,97,404

404,0,97,256

256,97,0,404

404,97,256,0

(a)

(b)

One molecule

(c)

(d)

Conductance

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,

Thus, highest

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Q 18.

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

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

Chelates

Ambident

Lewis acid

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Q 20.

Colour

Structure

Hybridisation

magnetic moment

Due to different n linkage, of

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Q 21.

Potassium diamminedicyanosulphatosuperoxo palatinate (IV) is

Anion is

+4 +0

Cation is

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Q 22.

Arrange the following in order of decreasing number of unpaired electrons

I.

III.

IV, I, II, III

I, II, III, IV

III, II, I, IV

II, III, I, IV

**Complex ligand Unpaired**

**Electrons**

I.

II.

III.

IV.

Thus,

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Q 23.

Among the following metal carbonyls,

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

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Q 24.

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

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Q 25.

In spectrochemical series chlorine is above than water *i.e*.,

Good

Strong

Good

Larger size of Cl than

When ligands are arranged in ascending order of crystal field splitting energy,

In comparison to

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