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Introduction

Which of the ...

Question

Which of the following is diamagnetic?
(I) $K_{4} [F e (C N)_{6}]$ (II) $K_{3} [C r (C N)_{6}]$ (III) $K_{3} [C o (C N)_{6}]$ (IV) $K_{2} [N i (C N)_{4}]$

I, II and IV

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I, III and IV

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II and III

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I and IV

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Solution

The correct option is B I, III and IV
In the complexes $K_{4} [F e (C N)_{6}], K_{3} [C o (C N)_{6}] a n d K_{2} [N i (C N)_{4}]$ , all the electrons are paired. These complexes are low spin inner orbital complexes.
Hence, they are diamagnetic complexes.

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Similar questions

Stable complex based on EAN rule:

i) $K_{4} [F e (C N)_{6}]$

ii) $[C o (N H_{3})_{5} C l] C l_{2}$

iii) $[N i (C O)_{4}]$

iv) $K_{2} [N i (C N)_{4}]$

[C o (N O_{2})_{6}]^{4 -}

[C o (N O_{2})_{6}]^{3 -}

K_{4} [F e (C N)_{6}]

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

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

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

Among the following structures I to IV
I. II. III. IV.
It is true that

i .

N a N O_{3}

i i .

B a {C l}_{2}

i i i .

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

i v .

C_{6} H_{12} O_{6}

C r (N H_{3})_{3} C l_{3}

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

C o B r_{2} (e n)_{2}]^{+}

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