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Discuss whether the following phenomena are reversible.(i) Water fall, (ii) Rusting of iron, (iii) Electrolysis |
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Answer» (i) Water fall- The falling of water is not a reversible process. During the fall of water, the major part of its potential energy is converted into kinetic energy of water. On striking the ground, a part of it is converted into heat and sound energy. It is not possible to convert the heat and sound produced along with the K.E. of water into potential energy so as to make the water rise back to the initial height .Therefor, waterfall is not reversible process. (ii) Rusting of iron- In the rusting of iron, the iron oxidized by the oxygen from the air. Since, it is a chemical change, it is not a reversible process. (iii) Electrolysis- It is a reversible process, provided the resistance of the electrolyte to the flow of current is zero.On reversing the direction of current, the direction of motion of ions is reversed. |
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