It is noticed that Pb 2 + is more stable than Pb 4 + but Sn 2 + is less stable than Sn 4 + . Observe the following reactions. PbO 2 + Pb ? 2 PbO ; r G ° ( 1 ) [2026]

Question

It is noticed that ${Pb}^{2 +}$ is more stable than ${Pb}^{4 +} but {Sn}^{2 +}$ is less stable than ${Sn}^{4 +}$ . Observe the following reactions.

${PbO}_{2} + Pb \to 2 PbO; Δ_{r} G ° (1)$

${SnO}_{2} + Sn \to 2 SnO; Δ_{r} G ° (2)$

Identify the correct set from the following: [2026]

Smart Achievers · Accepted Answer

(2)

${PbO}_{2} + Pb \to 2 PbO$

${Pb}^{2 +} is more stable hence reaction will be spontaneous. So Δ G_{r} ° (1) is negative.$

${SnO}_{2} + Sn \to 2 SnO$

${Sn}^{2 +} is less stable, so reaction will be non-spontaneous hence Δ G_{r} ° (2) is positive.$

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