Which of the following compound 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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F e_{4} [F e (C N)_{6}]_{3}

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N a_{2} C r O_{4}

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Solution

The correct option is B $N a_{2} [C d C l_{4}]$
$N a [C d C l_{4}]$ compound is not coloured. Because in this complex $C d$ is in $+ 2$ oxidation state and outer configuration is $4 d^{10}$ . All the orbitals are completely filled and there is no excitation of electrons, Thus it is colorless. Hence, option (b) is correct.

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