The aqueous solution of which of the following salt will have the lowest pH

Options

(a) NaClO₃
(b) NaClO
(c) NaClO₄
(d) NaClO₂

Correct Answer:

NaClO₄

Explanation:

NaClO₄, on hydrolysis, gives strongest acid HClO₄ as compared to other salts. this is strongly ionized and gives highest concentration of H⁺. therefore aqueous solution of NaClO₄ will have lowest pH value.