Question

1. The process of electrolysis can be used for the purification of copper. In this process, 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 transferred to the thin copper plate. Copper sulphate solution is used for this process. Answer the following questions with the information that you have now –

(a) Explain, how does copper from impure copper get deposited over the thin plate of copper?

(b) Write the chemical reactions that occur on-Anode, Cathode and in the Solution in this process.

(c) Using autodraw.com, draw the set-up/ circuit used in the process of purification.

2. A child staying in a coastal region tests the drinking water and also the seawater with his tester.

He finds that the compass needle deflects more in the case of seawater. Can you explain the

reason?

3. Why electroplating should not be done in factories?

4. (a) Is the circuit shown below made by Ishaan to study the chemical effects of electric current at

home correct?

(b) Why did he use a lemon instead of a battery?

(c) Why did he choose LED over tungsten bulb?​

Answer 1

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The citric acid in the lemon acts as an electrolyte, a solution that conducts electricity. The zinc nail sheds electrons as electrically charged ions into the acid (a process called “Oxidation” because the material loses electrons). The zinc nail will have a negative charge.

Answer 2

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Electrolysis of copper transfers copper atoms from an impure copper anode to a pure copper cathode, leaving the impurities behind. Unrefined copper is about 99 % pure. When current passes through the cell, these impurities go into solution from the anode, along with Cu.

Hope it helps uh !!