It is noticed that Pb 2+ is more stable than Pb 2+ but Sn 2+ is less stable than Sn 4+. Observe the following reactions PbO2 + Pb → 2PbO; rG° (A) SnO2 + Sn → 2SnO; rG° (B) Identify the correct set fro

Question

It is noticed that Pb 2+ is more stable than Pb 2+ but Sn 2+ is less stable than Sn 4+. Observe the following reactions PbO2 + Pb → 2PbO; rG° (A) SnO2 + Sn → 2SnO; rG° (B) Identify the correct set from the following. (1) rG°(1) > 0 ; rG°(2) < 0 (2) rG°(1) < 0 ; rG°(2) < 0 (C) rG°(1) < 0 ; rG°(2) > 0 (D) rG°(1) > 0 ; rG°(2) > 0

Prashant Kotian · Accepted Answer

Correct answer: C. PbO2 + Pb  2PbO Pb 2+ is more stable hence reaction will be spontaneous. So G°r(1) is negative. SnO2 + Sn  2SnO Sn +2 is less stable, so reaction will be non- spontaneous hance G°r(2) is positive.

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