Which of the following complex ion is not expected to absorb visible light?

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${[Cr {({NH}_{3})}_{6}]}^{+ 3}$

${[Ni (CN)_{4}]}^{- 2}$

${[Fe {(H_{2} O)}_{6}]}^{+ 3}$

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

answer is A.

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Detailed Solution

${[Ni (CN)_{4}]}^{- 2}$ Number of unpaired electrons in Ni⁺² (3d⁸) are zero, because of pairing of electrons in presence of strong field ligand i.e. CN^-

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