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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df160

Which of the following species in aqueous solution are both diamagnetic and coloured due to charge transfer?

A $MnO X_{4} X^{2 -}$
B $CrO X_{4} X^{2 -}$
C $MnO X_{4} X^{-}$
D $Cr X_{2} O X_{7} X^{2 -}$

Answer: B, C, D

Mn(VII) in

MnO X_{4} X^{-}

and Cr(VI) in

CrO X_{4} X^{2 -}

and

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

are

d^{0}

, so they are diamagnetic, and their colours are ligand-to-metal charge transfer.

MnO X_{4} X^{2 -}

contains Mn(VI)

d^{1}

and is paramagnetic.

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