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Question

Second law of thermodynamic define :

A.

Entropy

B.

Enthalpy

C.

Heat

D.

Work

Answer ( Option A)

Entropy

Solution

The second law of thermodynamics states that the total entropy of an isolated system can never decreases over time, and is constant if and only if all processes are reversible. Isolated systems spontaneously evolve towards thermodynamic equilibrium, the state with maximum entropy.

Hence, the correct option is (A).

&Key Points:-

For reversible process:

Final entropy (Sf) = Initial entropy (Si).

For irreversible process:

Final entropy (Sf) initial entropy (Si).

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