The name 'chlorate' is used for an anion consisting of chlorine and oxygen only. In a molecule of ICl, the iodine atom has oxidation number x and the chlorine atom has oxidation number y. When ICl is added to H2O, iodine is reduced. 4ICl + 2H2O → 4HCl + O2 + 2I2 Which statement about the value of x or y is correct?
✓ Correct Answer
The correct answer is A: x is the same as the oxidation number of Cl in the chlorate ion formed when Cl2(aq) is added to cold NaOH(aq).
📋 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.
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