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AIIMS 2009
Exam
AIIMS
Year
2009
Subject
Chemistry
Chapter
Thermodynamics (C)

AIIMS 2009 · Chemistry · Thermodynamics (C)

Assertion : A reaction which is spontaneous and accompanied by...

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.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

 (c) :ΔG=ΔH−TΔS− ve =ΔH−[T(− ve) ] (as spontaneous) \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.
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