Chapter - 4 Chemical Effects of Electric Current

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Q
Chemical Effects of Electric Current

Question:

The process that you saw in Activity 14.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transfered to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why? 

Answer:

An impure rod should be attached to the positive terminal of the battery.

Reasoning:

The thick rod of the impure copper plate is to be attached to the positive terminal of the battery because when an electric current is passed through the copper sulphate solution, it gets dissociated into copper and sulphate. The free copper, being positively charged, gets attracted towards the negative terminal of the battery and gets deposited on the thin plate of pure copper. The loss of copper from the solution is regained from the impure copper rod which is attached to the positive terminal of the battery.


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