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?
✓ Correct Answer
The correct answer is 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
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep