Explanation

(a)
Only salts of (weak acid+ strong base) and (strong acid + weak base) get hydrolysed ($i.e$., show alkalinity or acidity in water). $KClO_{4}$ a salt of strong acid and strong base, therefore, it does not get hydrolysed in water.
$KClO_{4}\ \rightleftharpoons K^{+}\ \ \ \ \ \ \ \ \ \ \ \ \ \ + \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {ClO}_{4}^{-}$
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