On being placed in water, sodium peroxide not only produces an alkaline solution but also some bubbles. If we assume that the peroxide ion picks up two protons from water to produce a compound that can be seen as the dibasic conjugate acid of peroxide ion and then this compound undergoes a redox disproportion.

Using the above information complete the following equation.

(A)  and (B)


Correct option is

NaOH and O2


From the given information, we can see that the reaction proceeds via formation of H2O2 (which is diabasic conjugate acid of peroxide ion), H2O2 then disproportionate into water and oxygen.

Thus overall reaction is



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