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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3qc107

Select the correct statements about manganese.

A $NaBiO X_{3}$ in nitric acid oxidises $Mn X^{2 +}$ to purple $MnO X_{4} X^{-}$
B $PbO X_{2}$ with concentrated $HNO X_{3}$ on boiling also converts $Mn X^{2 +}$ to $MnO X_{4} X^{-}$
C $Mn (OH) X_{2}$ is white but darkens to brown in air
DThe purple colour of $MnO X_{4} X^{-}$ arises from $d$ -- $d$ transitions

Answer: A, B, C

The first three are the standard observations. In

MnO X_{4} X^{-}

manganese is

d^{0}

, so no

d

--

d

transition is possible and the colour is from ligand-to-metal charge transfer. The last statement is false.

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