Physics Paper 2, May/June. 2010  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments

Question 3

When a lead-acid accumulator is fully charged, evolution of gases occurs at the electrodes. Name these gases and the respective electrodes at which they are given off.


Majority of the candidates attempted this question and performed satisfactorily.
The gases were correctly identified but the respective electrodes from which they were evolved were not correctly stated.
The expected answers are:
The gases are :
(i) Hydrogen
(ii) Oxygen
The electrodes at which they are evolved:
(i) Hydrogen                     Anode/lead peroxide
(ii)   Oxygen                       Cathode/lead plate

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