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Question

Chemistry Question on d -and f -Block Elements

In acidic medium, which of the following becomes colourless?

A

MnO4−MnO_4^-

B

MnO42−MnO_4^{2-}

C

CrO42−CrO_4^{2-}

D

FeO42−FeO_4^{2-}

Answer

MnO4−MnO_4^-

Explanation

Solution

MnO changes from purple to colourless in acidic solution while MnO is stable in acidic medium. Yellow coloured CrO changes to orange coloured CrO on acidifying and FeO decomposes.