When electricity is passed through a copper sulphate solution using carbon electrodes kept in the solution, it decomposes.

i. By what name is this process known?

ii. In which electrode is copper deposited during the reaction?

iii. Is there a colour change for the solution?

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Solution

i. Electrolysis

ii. Negative electrode

iii. The colour of the solution fades.

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Q. The following questions refer to the electrolysis of copper sulphate solution with copper electrodes:
(a) Compare the change in mass of the anode.
(b) What is seen to happen to the colour of the copper sulphate solution if platinum electrodes are used? Explain this observation.
(c) What is the practical application of the electrolysis of copper sulphate solution? Briefly, describe one such application.

Assertion: Upal observed that copper is deposited on the negative electrode connected to the terminal of the battery. Kavya performed the same experiment but she replaced the copper electrode with a carbon electrode and still observed copper is deposited over carbon rod.

Reason: Copper sulphate solution dissociates into copper and sulphate ions when electricity is passed through dilute copper sulphate solution and this free copper ions deposit on the carbon rod.

Q. An electric current is passed through silver nitrate solution using silver electrodes.

15.28

g of silver was found to be deposited on cathode. What will be the weight of copper deposited on cathode if same amount of electricity is passed through copper sulphate solution using copper electrodes?

Q. Keep two carbon rods immersed in a copper sulphate solution. Then pass electricity through the solution.

i. At which electrode does colour change occur anode or cathode?

ii. Is there any change in the blue colour of the copper sulphate solution?

iii. Write down chemical equations for the changes occurring here.

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When electricity is passed through a copper sulphate solution using carbon electrodes kept in the solution, it decomposes. i. By what name is this process known? ii. In which electrode is copper deposited during the reaction? iii. Is there a colour change for the solution?

i. Electrolysis ii. Negative electrode iii. The colour of the solution fades.

When electricity is passed through a copper sulphate solution using carbon electrodes kept in the solution, it decomposes.

i. By what name is this process known?

ii. In which electrode is copper deposited during the reaction?

iii. Is there a colour change for the solution?

i. Electrolysis

ii. Negative electrode

iii. The colour of the solution fades.