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 `HOCI` is `+1`. The conversion involves oxidation.
b) Oxidation number of `Mn` in `KMnO_(4)` is `+7` and in `K 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 electron transfer (neutralisation)