In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : The decomposition of hydrogen peroxide to form water and oxygen is an example of disproportionation reaction.
Reason (R) : The oxygen of peroxide is in –1 oxidation state and it is converted to zero oxidation state in O_{2} and –2 oxidation state in H_{2}O.
(i) Both A and R are true and R is the correct explanation of A.
(ii) Both A and R are true but R is not the correct explanation of A.
(iii) A is true but R is false.
(iv) Both A and R are false.

Answers (1)

The answer is the option (i) Both A and R are true, and R is the correct explanation of A.

Explanation: 2H_{2}O_{2}(aq) \rightarrow 2H_{2}O(l) + O_{2­}(g)

Here the oxygen of peroxide is present in -1 state, and it is converted to zero oxidation state in O_2 undergoing oxidation and decreases to -2 oxidation state in H_{2}Oundergoing reduction.

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