Igcse Model Questions Vol1 2025 Chemistry Question 22
Practice objective / multiple choice question 22 from the 2025 Igcse Model Questions Vol1 Chemistry examination.
A 0.60 g sample containing only ethanol (\(\mathrm{C_2H_5OH}\)) and 2‑propanol (\(\mathrm{(CH_3)_2CHOH}\)) is dissolved in 25.0 mL of acidified solution and oxidised completely by excess potassium dichromate. The reduction of dichromate produces 0.0125 mol of \(\mathrm{Cr^{3+}}\) ions, measured by complexation with 1,10‑phenanthroline. Assuming each mole of alcohol reduces one mole of dichromate, determine the mass percentage of ethanol in the original mixture.
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This is Igcse Model Questions Vol1 2025 Chemistry Question 22. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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