Question

what are Reversible and irreversible thermodynamic process????
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explanation with example plzzzzzzz

Answer 1

Thermodynamic processes can be carried out in one of two ways: reversibly or irreversibly. Reversibility means the reaction operates continuously at equilibrium. In an ideal thermodynamically reversible process, the energy from work performed by or on the system would be maximized, and that from heat would be zero. 
Irreversible processes, on the other hand, are a result of straying away from the curve, therefore decreasing the amount of overall work done; an irreversible process can be described as a thermodynamic process that departs from equilibrium.
Examples of irreversible processes.
Heat transfer through a finite temperature difference.Friction.Plastic deformation.
changes, like melting and dissolving, can be changed back again. Mixtures can be separated out by methods like filtering and evaporating.

Answer 2

A process whose all changes taking place in direct process are exactly repeated in the reverse order and no changes are left in any of the bodies taking part in the process or in the surroundings ,is called reversible process.

any process which is not reversible is called irreversible process !