Chemistry NEET Questions — Free MCQ Practice

Chemistry MCQs for NEET — Practice Questions with Answers

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The inner orbital complex which exhibits both geometrical as well as optical isomerism.

$[Cr (en)_{3}]^{3 +}$

$[{IrF}_{3} (H_{2} O)_{2} ({NH}_{3})]$

$[{NiCl}_{2} (en)_{2}]$

$[Co (CN)_{2} (ox)_{2}]^{3 -}$

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Explanation

(d) $[Cr (en)_{3}]^{3 +}$ ;Hyb. : $d^{2} {sp}^{3}$ ; does not exhibit geometrical isomerism but exhibits optical isomerism.

$[{IrF}_{3} (H_{2} O)_{2} ({NH}_{3})]$ ;Hyb. : $d^{2} {sp}^{3}$ ; exhibits geometrical but does not exhibit optical isomerism.

$[{NiCl}_{2} (en)_{2}]$ ;Hyb. : ${sp}^{3} d^{2}$ ; exhibits both geometrical isomerism and optical isomerism.

$[Co (CN)_{2} (ox)_{2}]^{3 -}$ ;Hyb. : $d^{2} {sp}^{3}$ ; exhibits both geometrical isomerism and optical isomerism.

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The hybridization of the complex $[{CrCl}_{2} ({NO}_{2})_{2} ({NH}_{3})_{2}]^{-}$ is:

${sp}^{3} d^{2}$

$d^{2} {sp}^{3}$

${sp}^{3} d$

cannot be predicted

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Which of the following statement is not true for the reaction given below?

$[Cu (H_{2} O)_{4}]^{2 +} + 4 {NH}_{3} \overset{}{⇌} [Cu ({NH}_{3})_{4}]^{2 +} + 4 H_{2} O$

It is a ligand substitution reaction.

${NH}_{3}$ is a relatively strong field ligand while $H_{2} O$ is a weak ligand

During the reaction , there is a change in colour from light blue to dark blue

$[Cu ({NH}_{3})_{4}]^{2 +}$ , has a tetrahedral structure and is paramagnetic

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Explanation

(d) In $[Cu ({NH}_{3})_{4}]^{2 +}$ , ${Cu}^{2 +}$ is ${dsp}^{2}$ hybridized , hence structure is square planar and complex is paramagnetic.

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Which of the following match is incorrect?

Complex compounds Type of hybridization

$[V ({NH}_{3})_{6}]^{3 +}$ : $d^{2} {sp}^{3}$

$[{CrCl}_{3} ({NMe}_{3})_{3}]$ : $d^{2} {sp}^{3}$

$[Cu (CN) ({NO}_{2}) ({NH}_{3}) (py)]$ : ${dsp}^{2}$

$K_{3} [Co (ox)_{3}]$ : ${sp}^{3} d^{2}$

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Explanation

(d) $K_{3} [Co (ox)_{3}]$ is inner orbital complex with $d^{2} {sp}^{3}$ hybridisation.

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The total possible coordination isomers for the following compounds respectively are:

$[Co (en)_{3}] [Cr (C_{2} O_{4})_{3}] [Cu ({NH}_{3})_{4}] [{CuCl}_{4}] [Ni (en)_{3}] [Co ({NO}_{2})_{6}$

4,4,4

2,2,2

2,2,4

4,2,4

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Explanation

(d)

$[Co (en)_{3}] [Cr (C_{2} O_{4})_{3}], [Co (C_{2} O_{4}) (en)_{2}] [Cr (C_{2} O_{4})_{2} (en)], [Cr (C_{2} O_{4}) (en)_{2}] [Co (C_{2} O_{4}) (en)], [Cr (en)_{3}] [Co (C_{2} O_{4})_{3}]$

Total coordination isomers = 4

$[Cu ({NH}_{3})_{4}] [{CuCl}_{4}], [CuCl ({NH}_{3})_{3}] [{CuCl}_{3} ({NH}_{3})]$

Total coordination isomers = 2

$[Ni (en)_{3}] [Co ({NO}_{2})_{6}], [Ni ({NO}_{2} (en)_{2}] [Co ({NO}_{2})_{4} (en)], [Co ({NO}_{2})_{2} (en)_{2}] [Ni ({NO}_{2})_{4} (en)], [Co (en)_{3}] [Ni ({NO}_{2})_{6}]$

Total no. of coordination isomers = 4

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Select the incorrect match:

$[Co ({NO}_{2}) (H_{2} O) (en)_{2}] {Cl}_{2}, [Cocl ({NO}_{2}) (en)_{2}] Cl \cdot H_{2} O$ : Hydrate isomerism

$[Cu ({NH}_{3})_{4}] [{PtCl}_{4}], [CuCl ({NH}_{3})_{3}] [{PtCl}_{3} ({NH}_{3})]$ : Co-ordination isomerism

$[Ni (CN) (H_{2} O) ({NH}_{3})_{4}] Cl, [NiCl (H_{2} O) ({NH}_{3})_{4}] CN$ : Ionization isomerism

$[Cr ({NO}_{2}) ({NH}_{3})_{5}] [{ZnCl}_{4}], [Cr ({NO}_{3}) ({NH}_{3})_{5}] [{ZnCl}_{4}]$ : Linkage isomerism

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Explanation

(d) ${NO}_{3}^{-}$ ion never acts as ambidentate ligand.

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Select incorrect statement about complex $[Cr ({NO}_{2}) ({NH}_{3})_{5}] [Zn (SCN)_{4}]$ :

It shows co-ordination isomerism

It shows optical activity

It shows linkage isomerism

IUPAC name of the compound is Pentaaminenitrito-N-chromium (III) tetrathiocyanato-S-zincate(II)

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Explanation

(b) Complex $[Cr ({NO}_{2}) ({NH}_{3})_{5}] [Zn (SCN)_{4}]$ can not shows optical activity .

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Unmatched characterstic of complex $[{PdCl}_{2} (H_{2} O)_{2} ({NH}_{3})_{2}]^{2 +}$ is :

Diamagnetic

Low spin

Geometrical isomerism

Fac. and Mer. form

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The following complexes are given :

$trans - [Co ({NH}_{3})_{4} {Cl}_{2}]^{+}$

$cis - [Co ({NH}_{3})_{2} (en)_{2}]^{3 +}$

$trans - [Co ({NH}_{3})_{2} (en)_{2}]^{3 +}$

${NiCl}_{4}^{2 -}$

(5) ${TiF}_{6}^{2 -}$

(6) ${CoF}_{6}^{3 -}$

Choose the correct code:

(a) (1),(2) are optically active, (3) is optically inactive

(b) (2) is optically active ; (1), (3) are optically inactive

(d) (4) is coloured and (5),(6) are colourless

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Which of the following complex compound exhibits cis-trans isomerism?

$[CoCl ({NH}_{3})_{4} (H_{2} O)]$

$[{CoCl}_{3} ({NH}_{3})_{3}]$

$[{CoCl}_{2} ({NH}_{3})_{4}]$

All of these

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