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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 kinetc energy of water. On strinking the ground , a part of it is converted into heat and sond 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. Therefore, water fall is not a reversible process. (ii) Rusting of Iron: In the rusting of irion, the iron gets oxidised 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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