Assertion(A) : In an isolated system, greater the disorder higher is the entropy
Reason(R) : When a system is in equilibrium, the entropy is maximum

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If both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A)

If assertion (A) is true but reason(R) is false

If assertion (A) is false reason (R) is true

If both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A)

answer is B.

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Detailed Solution

According to the Second Law of Thermodynamics a spontaneous change results in an increase in the entropy of the universe. In an isolated system, when the system's entropy reaches the maximum, the system stays there because any further change would reduce entropy.

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