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Q.

For which of the following species d-d transition does not account for its colour ?

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a

${Cr}_{2} O_{7}^{2 -}$

b

All

c

${CrO}_{4}^{2 -}$

d

${CrO}_{2} {Cl}_{2}$

answer is D.

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Detailed Solution

O.N. of Cr in all the species is + 6. Configuration of Cr (VI) is (Ar) 3d° Hence no d-d electron transition.

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