Question

answer all my question fast

Answer 1

the example of reversible is melting of wax ,cutting papers and the example of irreversible change is burning of papers , time

Answer 2

For a reversible process, you can change direction at any time without disturbing equilibrium.
For an irreversible process, the macroscopic variables may not always be defined.
For a reversible process, the system is ALWAYS in equilibrium with its surroundings.
For an irreversible process, there will ALWAYS be an entropy change.

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