The diamagnetic species is:

[C o (H_{2} O)_{6}]^{2 +}

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[N i (H_{2} O)_{6}]^{2 +}

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[C o (N H_{3})_{6}]^{3 +}

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[N i (N H_{3})_{6}]^{2 +}

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Solution

The correct option is C $[C o (N H_{3})_{6}]^{3 +}$
a) In $[C o (H_{2} O)_{6}]^{2 +}$ , $C o$ is in +2 oxidation state and electronic configuration of $C o^{2 +}$ is $t_{2 g}^{5} e_{g}^{2}$ . Since it contains unpaired electron it is paramagnetic in nature.
b) In $[N i (H_{2} O)_{6}]^{2 +}$ , $N i$ is in +2 oxidation state and electronic configuration of $N i^{2 +}$ is $t_{2 g}^{6} e_{g}^{2}$ . Since it contains unpaired electrons it is paramagnetic in nature.
c) In $[C o (N H_{3})_{6}]^{3 +}$ , $C o$ is in +3 oxidation state but $N H_{3}$ is a strong field ligand hence it will form a low spin complex and electronic configuration will be $t_{2 g}^{6} e_{g}^{0}$ .
There are no unpaired electrons. Hence, it is a diamagnetic species.
d) In $[N i (N H_{3})_{6}]^{2 +}$ , $N i$ is in +2 oxidation state and electronic configuration of $N i^{2 +}$ is $t_{2 g}^{6} e_{g}^{2}$ . Since it contains unpaired electron, it is paramagnetic in nature.

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Similar questions

Q. Among the following complexes, the diamagnetic complexes are:

(K) : K_{3} [F e (C N)_{6}]

(L) : [C o (N H_{3})_{6}] C l_{3}

(M) : N a_{3} [C o (o x a l a t e)_{3}]

(N) : [N i (H_{2} O)_{6}] C l_{2}

(O) : K_{2} [P t (C N)_{4}]

(P) : [Z n (H_{2} O)_{6}] (N O_{3})_{2}

The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, $[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}$
$[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}$
(a) $[C o (C N)_{6}]^{3 -} > [C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +}$
(b) $[C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +} > [C o (N H_{3})_{6}]^{3 +}$
(c) $[C o (H_{2} O)_{6}]^{3 +} > [C o (N H_{3})_{6}]^{3 +} > [C o (C N)_{6}]^{3 -}$
(d) $[C o (C N)_{6}]^{3 -} > [C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +}$

Q. The correct increasing order of wavelengths of absorption in the visible region for the complexes of

C o^{3 +}

is:

Q. Correct increasing order for the wavelength of absorbtion in the visible region for the complexes of

C o^{3 +}

is:

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $C o^{3 +}$ is

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