Which of the following compounds is not colored?

{N a}_{2} C u {C l}_{4}

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{N a}_{2} C d {C l}_{4}

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{N a}_{3} [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 A ${N a}_{2} C d {C l}_{4}$
Electronic configuration: $[K r] 4 d^{10} 5 s^{2}$
Cadmium is not considered as transition element which has completely filled d - configuration and is not having unpaired electrons to exhibit color property.
So $N a_{2} C d C l_{4}$ do not exhibit color
Hence option B is correct.

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