Gce Model Questions Vol1 2025 Chemistry Question 31
Practice objective / multiple choice question 31 from the 2025 Gce Model Questions Vol1 Chemistry examination.
A sample of 2‑methyl‑2‑butanol (C₆H₁₄O) weighing 5.00 g is treated with potassium dichromate in acidic medium. The oxidation (3 C₆H₁₄O + K₂Cr₂O₇ + 4 H₂SO₄ → 3 C₆H₁₂O + K₂SO₄ + Cr₂(SO₄)₃ + 7 H₂O) gives the ketone 3‑methyl‑2‑butanone, while any remaining alcohol can undergo dehydration (C₆H₁₄O → C₆H₁₂ + H₂O) using one mole of H₂SO₄ per mole of alcohol. The experiment uses 0.020 mol of K₂Cr₂O₇ and a total of 0.060 mol of H₂SO₄. Assuming the oxidation proceeds until either the dichromate or H₂SO₄ is exhausted and the remaining alcohol then dehydrates, calculate the mass of 3‑methyl‑2‑butanone obtained (give your answer to three significant figures).
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This is Gce Model Questions Vol1 2025 Chemistry Question 31. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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