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Q.

Assertion (A): Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason (R): Decrease in enthalpy is a contributory factor for spontaneity.

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a

If A is true but R is false.

b

If  both A  and R are  false

c

If both A and R are true and R is the correct explanation of A.

d

If both A and R are true but R is not the correct explanation of A.

answer is B.

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Detailed Solution

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Decrease in enthalpy and increase of entropy both are contributory factors for spontaneity. For any irreversible process ΔSTotal>O

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