Answer:
(i) Water fall. It is not a reversible process. During fall of the water, the major part of its potential energy is converted into kinetic energy of the water. However, on striking the ground, a part of it is converted into heat and sound. It is not possible to convert the heat and the sound produced along with the K.E. of water into potential energy so that the water may rise back to its initial height. Therefore, water fall is not a reversible process. (i) Rusting of iron. During rusting, iron gets oxidized by the oxygen of the air. Since it is a chemical change, it is not a reversible process. (iii) Electrolysis. It is a reversible process, provided the electrolyte does not offer any resistance to the flow of current. If we reverse the direction of current, the direction of motion of ions is also reversed.
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