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NEET2016ChemistryThermodynamics (C)Actual

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

G= H-T S As the reaction is accompanied by decrease in randomness, G= H+T S [ S is negative ] For reaction to be spontaneous G should be negative which is possible only if reaction is highly exothermic i.e H is negative. Exothermic reactions may be accompanied by increase or decrease of randomness.

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