Which of the following compounds is not coloured?

N a_{2} [C u C l_{4}]

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N a_{2} [C d C l_{4}]

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

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

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Solution

The correct option is B $N a_{2} [C d C l_{4}]$
$N a_{2} [C u C l_{4}]$ $C u = + 2$ or $C u^{2 +} \to 3 d^{9}$

$N a_{2} [C d C l_{4}]$ $C d = + 2$ or $C d^{2 +} \to 4 d^{10}$

$K_{4} [F e (C N)_{6}]$ $F e = + 2$ or $F e^{2 +} \to 3 d^{6}$

$K_{3} [F e (C N)_{6}]$ $F e = + 3$ or $F e^{3 +} \to 3 d^{5}$

Since $C d^{2 +}$ has completely filled d-subshell hence it is colourless.

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