Gce Model Questions Vol1 2020 Chemistry Question 47

Practice objective / multiple choice question 47 from the 2020 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Hard Difficulty
Question 47 GCE_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

2‑Butanol (\(\mathrm{C_{4}H_{10}O}\)) is oxidised with acidic potassium dichromate according to the overall reaction in which each \(\mathrm{Cr_{2}O_{7}^{2-}}\) ion can oxidise three molecules of a secondary alcohol. In a laboratory experiment 5.00 g of 2‑butanol is mixed with 0.050 mol of \(\mathrm{Cr_{2}O_{7}^{2-}}\) and the reaction is allowed to proceed to completion. The isolated product, butan‑2‑one, weighs 4.20 g.\n\n(a) Calculate the percent yield of butan‑2‑one.\n(b) Determine which reagent is the limiting reagent.

Answer Options

A. Percent yield = 78.2 %; limiting reagent = Cr₂O₇²⁻
B. Percent yield = 92.5 %; limiting reagent = 2‑butanol
Correct Answer C. Percent yield = 86.4 %; limiting reagent = 2‑butanol
D. Percent yield = 86.4 %; limiting reagent = Cr₂O₇²⁻
Correct Answer
C
Correct Option:
Percent yield = 86.4 %; limiting reagent = 2‑butanol

About This Question

This is Gce Model Questions Vol1 2020 Chemistry Question 47. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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