Fill in the blanks from the choices give in bracket : An alkali which completely dissociates into ions is …………… [ammonium hydroxide, calcium hydroxide, lithium hydroxide]

Choose the correct word which refers to the process of electrolysis from A to E, to match the description (i) to (iv): A: Oxidation, B: Cathode, C: Anode , D: An electrolyte , E : Reduction

(i) Conducts electricity in aq. or in molten state.

(ii) Loss of electrons takes place at anode.

(iii) A reducing electrode

(iv) Electrode connected to the positive end or terminal of the battery.

Identify the underlined substance: The electrode that increases in mass during the electro-refining of silver.

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

(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