$\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_5$

$\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_4$

$\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7$

$\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$

A, B, C

A, B only

B, C only

A, C only

$\mathrm{B}, \mathrm{Ga}$

$\mathrm{B}, \mathrm{Al}$

AI, In

$\mathrm{B}, \mathrm{TI}$

$\mathrm{Sn}^{+4}$ is reducing agent but $\mathrm{Pb}^{+4}$ is an oxidising agent.

$\mathrm{Sn}^{+4}$ is an oxidising agent but $\mathrm{Pb}^{+2}$ is a reducing agent.

$\mathrm{Sn}^{+2}$ is reducing agent but $\mathrm{Pb}^{+4}$ is an oxidising agent.

$\mathrm{Sn}^{+2}$ is an oxidising agent but $\mathrm{Pb}^{+4}$ is reducing agent.