May/June 2026 Paper 63

2026 · 4 questions · 23 parts · 40 marks

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1(a)1(b)1(c)1(d)1(e)1(f)

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2(a)2(b)2(c)2(d)2(e)2(f)2(g)2(h)2(i)

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3(a)3(b)3(c)3(d)3(e)3(f)3(g)

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Rhubarb plant leaves contain oxalic acid. Oxalic acid is soluble in water. Acidified aqueous potassium manganate(VII) changes from purple to colourless when it reacts with oxalic acid. Plan an experiment to find which of two rhubarb plant leaves, A and B, contains the highest concentration of oxalic acid. You are provided with two rhubarb plant leaves, A and B, acidified aqueous potassium manganate(VII) and common laboratory apparatus.

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