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JEE Main levelSingle correct optionDifficulty 2 of 3df126

In aqueous solution, the colour of which of the following is due to d-d transitions and not charge transfer?

A $Cr X_{2} O X_{7} X^{2 -}$
B $[Ti (H X_{2} O) X_{6}] X^{3 +}$
C $CrO X_{4} X^{2 -}$
D $MnO X_{4} X^{-}$

Answer: B

[Ti (H X_{2} O) X_{6}] X^{3 +}

is

3 d^{1}

, and its colour comes from a

t_{2 g} \to e_{g}

transition.

MnO X_{4} X^{-}

,

CrO X_{4} X^{2 -}

and

Cr X_{2} O X_{7} X^{2 -}

contain

d^{0}

metal ions, and their colours are charge transfer.

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