A) \[\text{ }\!\!\Delta\!\!\text{ H}\]is \[\text{(+)}\,\text{ve}\]and \[\text{ }\!\!\Delta\!\!\text{ S}\]is\[(+)ve\]
B) \[\text{ }\!\!\Delta\!\!\text{ H}\]is and\[(-)ve\] AS is\[(+)S\]
C) \[\text{ }\!\!\Delta\!\!\text{ H}\]and \[\text{ }\!\!\Delta\!\!\text{ S}\]are \[(+)ve\]but\[\Delta H>T\Delta S\]
D) \[\text{ }\!\!\Delta\!\!\text{ H}\]and \[\Delta S\]are \[(-)ve\]but \[\Delta H>T\Delta S\]
Correct Answer: C
Solution :
According to Gibbs Helmholtz equation,\[\Delta G=\Delta H-T\Delta S\] A chemical reaction cannot occur only when \[\Delta G=(+)ve.\]This condition is true when \[\Delta H\]and \[\Delta S\]both are \[\text{(+) ve}\] in such a way that \[\Delta H>T\Delta S\] [so that \[\Delta G\]remains\[\text{(+) ve}\]].
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