Q43 / 180 · AIIMS 2013 · Chemistry

Assertion : Entropy of system increases for a spontaneous reaction. Reason : Enthalpy of reaction always decreases for spontaneous reaction.

  • Correct answer
    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

(a) : $\Delta S$ is + ve and $\Delta H$ is - ve for a spontaneous reaction at all temperatures.

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

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