Reaction of solid `KMnO_4` which conc. `H_2SO_4` produces manganese heptoxide `(Mn_2O_7)` in

Options

A. Solution state
B. Solid state
C. Fine powder
D. None of these

Answer

A

Explanation

`KMnO_4` on treatment with conc. `H_2SO_4` forms manganese heptoxide via permanganyl sulphate which decomposes explosively on heating.
`2KMnO_4 + 3H_2SO_4 to 2KHSO_4 + (MnO_3)_2 SO_4 + 2H_2O`
`(MnO_3)_2 SO_4 + H_2O to underset("red - brown liquid")(Mn_2O_7) + H_2SO_4`
`Mn_2O_7 to 2MnO_2 + 3/2 O_2`
`:. Mn_2O_7` so formed is a red -brown liquid.