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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_2O_2`

C

`KNO_3`

D

`Pb(NO_3)_2`

Text Solution

Verified by Experts

The correct Answer is:
B
`2H_2O_2 overset("Heat")(rarr)2H_2O + O_2 , 2KI + H_2O_2 overset("Acidic")(rarr) 2KOH + underset("Brown")(I_2)`
Acidified `KMnO_4` acts as an oxidising agent when it is decolourised, `H_2O_2 + O to H_2O + O_2`.
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