Mention whether each of the following conversion involves oxidation or reduction.
a) `HCl rarr HOCl,` b) `KMnO_(4)rarrK_(2)MnO_(4)` and c) `HNO_(3)rarr NaNO_(3)`

Explanation

(a) Oxidation number of Cl in HCl is -1 and in HOCl is +1. The conversion involves oxidatioin.
(b) Oxidation number of Mn in `KMnO_(4)` is +7 and in `K_(2)MnO_(4)` is +6. The conversion involves reduction.
(c ) Oxidation number of N in `HNO_(3)` is +5 and in `NaNO_(3)` is +5. The conversion involves neither oxidation nor reduction. It involves no electrons transfer (neutralisation).