Q .     Manganese salt `+ PbO_2 +` conc.`HNO_3 ->` the
solution acquires purple colour. The colour
is due to

UPSEE 2013
A

`Mn (NO_3 )_2`

B

`Pb(NO_3)_2`

C

`HMnO_4`

D

`MnO`

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