A-LevelChemistryNitrogen and sulfur9701/12 · Feb/Mar 2020 · Q151 Mark

Solid ammonium nitrate is put into a test-tube and solution X is added to it. The resulting mixture is warmed and the gas given off is tested with damp red litmus paper. The litmus paper changes colour from red to blue. What could be the identity of X and its role in the reaction?

Aidentity of X: NaOH(aq), role of X: proton donor

Bidentity of X: NaOH(aq), role of X: proton acceptor

Cidentity of X: HCl(aq), role of X: proton donor

Didentity of X: HCl(aq), role of X: proton acceptor

✓ Correct answer

B: identity of X: NaOH(aq), role of X: proton acceptor

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Topic: Nitrogen and sulfur, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2020 Paper 1 Variant 2, question 15.

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