Igcse Model Questions Vol1 2020 Chemistry Question 18

Practice objective / multiple choice question 18 from the 2020 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Hard Difficulty
Question 18 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

A 12.0 g sample of an unknown primary alcohol with molecular formula \(\mathrm{C}_n\mathrm{H}_{2n+2}\mathrm{O}\) is oxidised by excess \(\mathrm{K}_2\mathrm{Cr}_2\mathrm{O}_7\) in acidic medium to give the corresponding carboxylic acid. The mass of the acid obtained is 14.8 g. Determine the value of \(n\), write the molecular formula of the alcohol, and calculate the mass of oxygen atoms that were added during the oxidation.

Answer Options

Correct Answer A. n = 3; alcohol formula \(\mathrm{C}_3\mathrm{H}_8\mathrm{O}\); oxygen added = 2.8 g
B. n = 2; alcohol formula \(\mathrm{C}_2\mathrm{H}_6\mathrm{O}\); oxygen added = 1.9 g
C. n = 4; alcohol formula \(\mathrm{C}_4\mathrm{H}_{10}\mathrm{O}\); oxygen added = 3.7 g
D. n = 5; alcohol formula \(\mathrm{C}_5\mathrm{H}_{12}\mathrm{O}\); oxygen added = 4.5 g
Correct Answer
A
Correct Option:
n = 3; alcohol formula \(\mathrm{C}_3\mathrm{H}_8\mathrm{O}\); oxygen added = 2.8 g

About This Question

This is Igcse Model Questions Vol1 2020 Chemistry Question 18. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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