A-LevelChemistryElectrochemistry9701/12 · May/June 2024 · Q121 Mark

Phosphorus reacts with concentrated sulfuric acid to produce phosphoric acid, sulfur dioxide and water. aH2SO4 + bP → CH3PO4 + dSO2 + eH2O a, b, c, d and e are all whole numbers. The equation can be balanced by using oxidation numbers. What is the value of the sum a + b + c + d + e?

A10

B14

C15

D16

✓ Correct answer

D: 16

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2024 Paper 1 Variant 2, question 12.

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