A-LevelChemistryGroup 179701/12 · May/June 2024 · Q211 Mark
The table shows statements about some of the properties of halogens and their compounds and explanations for these properties. [Table 21.1] Which row shows a correct statement about the property and a correct explanation for the statement?
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Astatement: iodine is a solid at room temperature, explanation: the I–I bond strength is high
Bstatement: the decomposition of hydrogen iodide is more endothermic than the decomposition of hydrogen chloride, explanation: chlorine is more reactive than iodine
Cstatement: when chlorine is bubbled into aqueous potassium iodide, a purple solution is seen, explanation: chlorine is a stronger oxidising agent than iodine
Dstatement: when concentrated sulfuric acid is added to solid potassium iodide, a purple vapour is seen, explanation: iodide ions are being oxidised to iodine by the sulfuric acid
✓ Correct answer
D: statement: when concentrated sulfuric acid is added to solid potassium iodide, a purple vapour is seen, explanation: iodide ions are being oxidised to iodine by the sulfuric acid
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