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Co^(2+)(aq)+SCN^(-)(aq) to "complex" (X)...

`Co^(2+)(aq)+SCN^(-)(aq) to "complex" (X)`.
`Ni^(2+)(aq)+"Dimethylglyoxime" overset(NH_(4)OH) to "Complex" (Y)`.
The coordination number of cobalt and nickel in complexes X and Y are four.
Select the correct statement for the complexes (X) and (Y).

A

(X) is paramagnetic with two unpaired electrons

B

(Y) is diamagnetic and shows intermolecular H-bonding.

C

(X) is paramagnetic with three unpaired electrons and(Y) is diamagnetic

D

(X) and (Y) both are diamagnetic .

Text Solution

Verified by Experts

(C) `X=[Co(SCN)_(4)]^(2-)` , cobalt is in +2 oxidation state and `SCN^(-)` is weak field ligand. So
`[Co(SCN)_(4)]^(2-)`:

`[Ni(dmg)_(2)]`: Nickel is in +2 oxidation state and dmg is chelating ligand. So,
`[Ni(dmg)_(2)]:`

`[Ni(dmg)_(2)]` shows intra molecular H-bonding as shown below.
Reactions involved :
`Cpo^(2+)(aq)+4SCN^(-)(aq) rarr [Co(SCN)_(4)]^(2-)(aq.)`
blue colure complex.
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