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A-LevelChemistryGroup 179701/12 · Feb/Mar 2024 · Q211 Mark

This question is about two salts, NaI and NaCl. The two solid salts are separately added to warm concentrated H₂SO₄ and the results noted. Aqueous solutions of the two salts are separately added to AgNO₃(aq) and then concentrated NH₃(aq) is added and the results noted. Which row is correct?

Asalt: NaCl, identity of one product formed with concentrated H₂SO₄: Cl₂, observation after AgNO₃(aq) and NH₃(aq) are added: colourless solution
Bsalt: NaCl, identity of one product formed with concentrated H₂SO₄: H₂S, observation after AgNO₃(aq) and NH₃(aq) are added: white precipitate
Csalt: NaI, identity of one product formed with concentrated H₂SO₄: H₂S, observation after AgNO₃(aq) and NH₃(aq) are added: yellow precipitate
Dsalt: NaI, identity of one product formed with concentrated H₂SO₄: I₂, observation after AgNO₃(aq) and NH₃(aq) are added: colourless solution

✓ Correct answer

C: salt: NaI, identity of one product formed with concentrated H₂SO₄: H₂S, observation after AgNO₃(aq) and NH₃(aq) are added: yellow precipitate

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About this question

Topic
Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source
A-Level Chemistry, Feb/Mar 2024 Paper 1 Variant 2, question 21.

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