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Which of the following complex compounds is not colored?

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Na₂[CuCl₄]

Na₂[CdCl₄]

K₃[Fe(CN)₆]

K₄[Fe(CN)₆]

answer is B.

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Detailed Solution

Oxidation state of Cd in Na₂[CdCl₂] is +2 and its outer electronic configuration becomes 4d¹⁰.
Due to filled d-orbitals, there is no d-d transition taking place.
Hence, the compound does not show any color.

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