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ICSE Class 10 Chemistry Question 60 of 60

Electrolysis — Question 60

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Question 8(2020)

An aqueous solution of nickle [II] sulphate was electrolyzed using nickle electrodes. Observe the diagram and answer the questions that follow:

An aqueous solution of nickle [II] sulphate was electrolyzed using nickle electrodes. What do you observe at the cathode and anode respectively. Name the cation that remains as a spectator ion in the solution. Which equation for the reaction at the anode is correct. Electrolysis, Simplified Chemistry Dalal Solutions ICSE Class 10.

(i) What do you observe at the cathode and anode respectively.

(ii) Name the cation that remains as a spectator ion in the solution.

(iii) Which equation for the reaction at the anode is correct.

  1. Ni ⟶ Ni2+ + 2e-
  2. Ni + 2e- ⟶ Ni2+
  3. Ni2+ ⟶ Ni + 2e-
  4. Ni2+ + 2e- ⟶ Ni
Answer

(i) The observations at cathode and anode are:
At cathode: Ni2+ ions move towards cathode and are discharged as neutral Ni atoms by gain of electrons. Thus, Ni is deposited at cathode.
At anode: Diminishes in mass. Ni2+ ions are formed.

(ii) H+ ions.

(iii) Ni ⟶ Ni2+ + 2e-