Q44 / 180 · AIIMS 2009 · Chemistry

Assertion : A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic. Reason : All exothermic reactions are accompanied by decrease of randomness.

  • 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
  • Correct answer
    C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

$\begin{aligned} & \text { (c) }: \Delta G=\Delta H-T \Delta S \\ & - \text { ve }=\Delta H-[T(- \text { ve) }] \text { (as spontaneous) }\end{aligned}$ Exothermic reactions may be accompanied by increase or decrease of randomness.

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

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