Q53 / 160 · JIPMER 2007 · Chemistry

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

  • A
    Exothermic and decreasing disorder
  • B
    Endothermic and increasing disorder
  • Correct answer
    C
    Exothermic and increasing disorder
  • D
    Endothermic and decreasing disorder

Solution

If reaction is exothermic, therefore, $\Delta H$ is - ve and on increasing disorder, $\Delta S$ is + ve thus, at these condition, $\Delta G$ is negative according to following equation. $\Delta G=\Delta H-T \Delta S$ $\Delta G=-$ ve. Hence, for spontaneous reaction $\Delta G$ must be - ve.

Hence, the correct answer is option: 'C'.

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