A-LevelChemistryGroup 17May/June 2012Paper 1 Q161 Mark

Chlorine shows oxidation states ranging from −1 to +7 in its compounds. What are the reagent(s) and conditions necessary for the oxidation of elemental chlorine into a compound containing chlorine in the +5 oxidation state?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is D: hot concentrated NaOH(aq).

Q: What topic does this question test?

This question tests Group 17 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

AAgNO3(aq) followed by NH3(aq) at room temperature

Bconcentrated H2SO4 at room temperature

Ccold dilute NaOH(aq)

Dhot concentrated NaOH(aq)

✓ Correct Answer

The correct answer is D: hot concentrated 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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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Group 17 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2012 examination, Paper 1 Variant 2.

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