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Why pure metal he is always collected at the cathode during electrolytic refining |
| Answer» In general, the polarity of cathode and anode is decided on the basis of the device used for different purposes. In electrolytic cell, cathode is taken as negative electrode while anode is taken as positive electrode. The two types of ions in refining are cations and anions. Cations carry pure metal while the anions carry the impurity. And since cations always possess positive charge therefore they are attracted towards cathode as they are negatively charged (unlike charges attract each other) while the anions carry negative charge hence they get attracted towards anode. Hence pure metal is always collected at the cathode. | |