Option (ii) Both A and R are true but R is not the correct explanation of A.
The decomposition of hydrogen peroxide gives water and oxygen molecule as a product. The oxidation number of oxygen in peroxide is -1 and that of hydrogen is +1. Thus oxygen under consideration is reduced from -1 to -2 in H2O molecule whereas it is oxidized to zero in oxygen molecule.
Thus both statements are true, but the main driving force is reason that peroxide undergoes disproportionation reaction is due to the availability of more stable oxygen molecule and water form for the peroxide. Thus the statement two is not the correct explanation for the (A).
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