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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_(2)O_(2)`

C

`KNO_(3)`

D

`Pb(NO_(3))_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`2H_(2) O_(2) overset("Hert")(rarr) 2 H_(2) O +O_(2): 2KI +H_(2) O_(2) overset("Acidic") (rarr) 2KOH + underset("Brown") (I_(2))`
Acidified `KMnO_(4)` acts as an oxidising agent when it si decolourised `H_(2) O_(2) + O rarr H_(2) O + O_(2)`
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