An inorganic substance liberates oxygen ...

An inorganic substance liberates oxygen on heating and turns an acidic solution of KI brown and reduces acidified `KMnO_4` solution. The substance is

A

HgO

B

`H_2O_2`

C

`KNO_3`

D

`Pb(NO_3)_2`

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The correct Answer is:

A

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