Igcse Model Questions Vol1 2025 Chemistry Question 38
Practice objective / multiple choice question 38 from the 2025 Igcse Model Questions Vol1 Chemistry examination.
A 20.0 g mixture of 2‑propanol (\(\mathrm{C_3H_8O}\), \(M = 60.10\ \text{g mol}^{-1}\)) and 1‑butanol (\(\mathrm{C_4H_{10}O}\), \(M = 74.12\ \text{g mol}^{-1}\)) is oxidised with excess acidified potassium dichromate. The 2‑propanol is converted to acetone (\(M = 58.08\ \text{g mol}^{-1}\)), which is distilled off together with water. The distillate collected has a volume of 30.0 mL at 25 °C and is known to contain 70 % acetone by mass (the remainder is water, density \(1.00\ \text{g mL}^{-1}\); acetone density \(0.7845\ \text{g mL}^{-1}\)). Assuming quantitative oxidation, calculate the masses of 2‑propanol and 1‑butanol that were present in the original mixture.
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This is Igcse Model Questions Vol1 2025 Chemistry Question 38. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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