In thermodynamics, a process is called reversible when

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Surroundings and system change into each other

There is no boundary between system and surroundings

Surroundings are always in equilibrium with system

System changes into surroundings spontaneously

answer is C.

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Detailed Solution

A reversible process is one that can be changed from one direction to the other by causing minute changes in the system through its surroundings.

Equilibrium operates at quasi equilibrium in reversibility. The procedure is carried out in a way that ensures the equilibrium terms and conditions are upheld at every stage.

The system and its surroundings are in thermodynamic equilibrium during the reversible process. Due to its reversibility, it has no aftereffects on the surroundings or the system.

Hence the correct option is (C).

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