A-LevelChemistryAnalytical techniquesOct/Nov 2018Paper 1 Q271 Mark

Compound X has the empirical formula C2H3O. Compound X reacts with 2,4-dinitrophenylhydrazine reagent to give an orange precipitate and also decolourises warmed acidified potassium manganate(VII) solution. What could be the identity of X?

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

The correct answer is A: [Diagram of CH3COCH2OH].

Q: What topic does this question test?

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

A[Diagram of CH3COCH2OH]

B[Diagram of CH3CH(OH)CHO]

C[Diagram of HOCH2COCH2OH]

D[Diagram of HOCH2CH2COOH]

✓ Correct Answer

The correct answer is A: [Diagram of CH3COCH2OH]

📋 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 Analytical techniques in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2018 examination, Paper 1 Variant 2.

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