A) spontaneous at all temperatures
B) non-spontaneous at low temperatures
C) non-spontaneous at high temperatures
D) spontaneous at high temperatures
Correct Answer: C
Solution :
An exothermic reaction with \[\Delta S=-ve,\]is spontaneous, when: \[\Delta H>T.\,\Delta S\] i.e., at low temperatures. Since from, Gibbs-Helmholtz equation. \[\Delta G=\Delta H-T.\Delta G\] \[\Delta G\] to be negative, \[\Delta H>T.\,\Delta S\] (if \[\Delta H=-\,ve,\]\[\Delta S=-\,ve\]) Hence, reaction will be non-spontaneous at high temperatures.
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