Question

As compared to $H_{2}S{O}_5,H_2{S}_2{O}_8:$

• A. Has two peroxy linkage
• B. Liberates $I_2$ from $KI$ slowly and thus kinetics of oxidation of $KI$ by $S_2{O}_8^{2-}$ can be studied
• C. Has different oxidation number
• D. Reacts with $KMn{O}_4$

Answer 1

The correct option is B Liberates $I_2$ from $KI$ slowly and thus kinetics of oxidation of $KI$ by $S_2{O}_8^{2-}$ can be studied

$KI+H_2{S}_2{O}_8\to I_2$

$I_2+2S_2{O}_3^{2-}\to S_4{O}_6^{2-}+2I$

Hence $H_2{S}_2{O}_8$ liberates $I_2$ from $KI$ solution.