InterviewSolution
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InterviewSolution
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In view of the signs of `Delta_(r)G^(0)` for the following reactions `PbO_(2)+Pbrarr2PbO,Delta_(r)G^(0)lt0` `SnO_(2)+Snrarr2SnO,Delta_(r)G^(0)gt0` Which oxidation state are more characteristic for lead and tin?A. For lead `+4` , for tin `+2`B. For lead `+2` , for tin `+2`C. For lead `+4` , for tin `+4`D. For lead `+2` , for tin `+4` |
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Answer» Correct Answer - A Oxidation state `underset(+4)pbO_(2)+underset(0)Pbrarrunderset(+2)2PbO` Since `DeltaG^(@)lt0` , i.e., it is negative. Therefore, the reaction is spontaneous in the forward direction. This suggest `Pb^(2+)` is more stable than `Pb^(4+)` . Oxidation state `underset(+4)SnO_(2)+underset(0)Snrarrunderset(+2)2SnO` Since `DeltaG^(@)gt0` , i.e., it is positive, therefore, the reaction is non-spontaneous in the forward direction.But it will be spontaneous in the backward direction. This suggests that `Sn^(2+)` . These facts are also supported by the inert pair effect down the group. |
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