A-LevelChemistryGroup 179701/12 · Oct/Nov 2020 · Q171 Mark

Which statement about Group 17 elements and their compounds is correct?

AChlorine reacts with cold concentrated sodium hydroxide to form NaCl and NaClO₃.

BHCl is more thermally stable than HBr because chlorine is less electronegative than bromine.

CIodide ions are oxidised to iodine by concentrated sulfuric acid.

DSilver iodide is soluble in dilute aqueous ammonia.

✓ Correct answer

C: Iodide ions are oxidised to iodine by concentrated sulfuric acid.

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2020 Paper 1 Variant 2, question 17.

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