11th Class Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank 11th CBSE Chemistry Thermodynamics

  • question_answer
    An exothermic reaction may not be always thermodynamically spontaneous. Justify.

    Answer:

                    In general, those changes or reactions may be spontaneous in which \[\Delta G\] is -ve. Now,\[\Delta G=\Delta H-T\Delta S\]. The negative \[\Delta H\] always favours the spontaneous change or reaction. In case entropy factor opposes (i.e., \[\Delta S\] is -ve) and its magnitude is more than that of\[\Delta H\] under the circumstances \[\Delta G\] will be positive. The change or reaction may not be spontaneous.


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