(a). A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B).
(b). The solution of (B) The solution of (B) in boiling water on acidification with dilute `H_2SO_4` gives a pink coloured compound (C).

Options

A. It oxidises ammonia to nitrogen dioxide in neutral medium.
B. it's pink colour is due to d-d transition.
C. it can be oxidised by ozone
D. it is obtained by alkaline fusion of pyrolusite followed by electrolytic oxidation.

Answer

D

Explanation

(A) `2MnO_(4)^(-)+2NH_(3) to 2MnO_(2)+N_(2)+2OH^(-)+2H_(2)O`
it is due to charge transfer from `O_(2-)` to empty d-orbital of `Mn(VII)`.
`MnOO_(4)^(-)` is in highest oxidation state i.e+VII and thus can not ve oxidised further.
`MnO_(2)+OH to MnO_(2)^(2-)undersetto([e^(-)])MnO_(4)^(-)`