Neco 2022 Chemistry Question 35

Practice objective / multiple choice question 35 from the 2022 Neco Chemistry examination.

Neco 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 35 NECO • 2022 • CHEMISTRY • objective

2‑Methyl‑1‑propanol (isobutyl alcohol) with formula \(\mathrm{C_4H_{10}O}\) is oxidised by excess potassium dichromate in acidic medium to give the corresponding aldehyde. If 10.0 g of the alcohol is used and 7.5 g of aldehyde are obtained, (a) calculate the percent yield of the aldehyde, and (b) determine the mass of \(\mathrm{Cr^{3+}}\) formed assuming the dichromate is reduced from \(\mathrm{Cr_2O_7^{2-}}\) to \(\mathrm{Cr^{3+}}\).

Answer Options

A. Percent yield = 75.0 %; mass of Cr^{3+} = 4.90 g
B. Percent yield = 72.5 %; mass of Cr^{3+} = 4.20 g
C. Percent yield = 80.1 %; mass of Cr^{3+} = 5.12 g
Correct Answer D. Percent yield = 77.2 %; mass of Cr^{3+} = 4.67 g
Correct Answer
D
Correct Option:
Percent yield = 77.2 %; mass of Cr^{3+} = 4.67 g

About This Question

This is Neco 2022 Chemistry Question 35. It is one of the objective questions from the 2022 Neco Chemistry examination.

Difficulty level: Medium .

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