Chemistry · May / June 2026 · Paper 41 · Question 5
0620
As printed in the paper
The question as text
This question is about the effects of electricity on chemical substances.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
5(a)(i)[1]
electrolysis
5(a)(ii)[2]
M1 inert(1)
M2 good conductor of electricity(1)
5(a)(iii)[2]
2H+ + 2e(–) → H2
M1 H+ + e on LHS of equation(1)
M2 equation fully correct(1)
5(a)(iv)[2]
M1 hydroxide ion is negative
OH- is negative(1)
M2 There are 4 alternatives that can get M2 based on:
movement of negative ions to anodeconcentrationprocess of hydroxide(ions) forming oxygenoxygen formed and not chlorinehydroxide ion is attracted to electrode of opposite charge or positive charge/ hydroxide ion is attracted to positive anode(1)
5(a)(v)[1]
electron(s)
5(a)(vi)[2]
M1 anode: chlorine(1)
M2 cathode: hydrogen(1)
5(b)(i)[1]
bauxite
5(b)(ii)[1]
aluminium oxide
5(b)(iii)[1]
(molten)cryolite
5(b)(iv)[2]
M1 anodes or carbon react with oxygen(1)
M2 (form) carbon dioxide(1)
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.