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JEE Main levelSingle correct optionDifficulty 2 of 3pn098

Complete hydrolysis of one mole of peroxodisulphuric acid, $H X_{2} S X_{2} O X_{8}$ , gives

A1 mol $H X_{2} SO X_{5}$ and 1 mol $H X_{2} S$
B1 mol $H X_{2} SO X_{4}$ and 1 mol $H X_{2} SO X_{3}$
C2 mol $H X_{2} SO X_{4}$ and 1 mol $H X_{2} O X_{2}$
D2 mol $H X_{2} SO X_{3}$ and 1 mol $O X_{2}$

Answer: C

H X_{2} S X_{2} O X_{8} + 2 H X_{2} O 2 H X_{2} SO X_{4} + H X_{2} O X_{2}

(via Caro's acid

H X_{2} SO X_{5}

as intermediate). The O-O peroxo linkage is converted to

H X_{2} O X_{2}

while S stays in the +6 state.

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