JEE Advanced 2024 · Paper 2 · Chemistry Q7

ChemistryMultiple correct+4 / -2Question 41 of 51

The compound(s) having peroxide linkage is(are)

\ce{H2S2O7}

\ce{H2S2O8}

\ce{H2S2O5}

\ce{H2SO5}

Answer and worked solution

Official answer: B, D

(A) $\ce{H2S2O7}$ (pyrosulphuric acid) has an $\ce{S-O-S}$ bridge. No peroxide. ✗
(B) $\ce{H2S2O8}$ (peroxodisulphuric acid) is $\ce{HO3S-O-O-SO3H}$ . ✓
(C) $\ce{H2S2O5}$ (pyrosulphurous acid) has an $\ce{S-S}$ bond. No peroxide. ✗
(D) $\ce{H2SO5}$ (Caro's acid, peroxomonosulphuric acid) is $\ce{HO-O-SO2-OH}$ . ✓

JEE Advanced 2024 · Paper 2, Chemistry question 7