WAEC Physics 2010 Theory — Question 3
Question 3 of 22 from the West African Examinations Council (WAEC) Physics 2010 Theory paper, with the correct answer and a full explanation.
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3. When a lead-acid accumulator is fully charged, evolution of gases occurs at the respective electrodes at which they are given off. State two factors which affect the mass of elements deposited during electrolysis.
Model answer
When a lead-acid accumulator is fully charged, the gases given off are: (i) Hydrogen (at the anode, which is lead peroxide) (ii) Oxygen (at the cathode, which is lead plate). Factors that affect the mass of elements deposited during electrolysis: (i) quantity of electricity, (ii) nature/e.c.e of electrochemical equipment.
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