Question

Assertion: Decomposition of hydrogen peroxide is an example of disproportionation reaction.
Reason : In a disproportionation reaction, an element in one oxidation state is simultaneously oxidised and reduced.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (A)

The oxidation states are
$\overset{+1-1}{2 H _{2} O _{2} (aq)} \rightarrow \overset{+1-2}{2 H _{2} O_{(l)}} + \overset{0}{O _{2}(g)}$
Oxidation State of Oxygen of peroxide increases to o from $-1$ in $O _{2}$ and decreases to $-2$ in $H _{2} O$..