Neco Model Questions Vol1 2023 Chemistry Question 21

Practice objective / multiple choice question 21 from the 2023 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2023 Chemistry Objective / Multiple Choice Hard Difficulty
Question 21 NECO_MODEL_QUESTIONS_VOL1 • 2023 • CHEMISTRY • objective

In a laboratory oxidation, 10.0 g of 2‑butanol (\(C_4H_{10}O\)) is treated with 5.0 g of potassium dichromate (\(K_2Cr_2O_7\)) in acidic medium to give butan‑2‑one. (a) Identify the limiting reagent. (b) Calculate the theoretical mass of butan‑2‑one that can be formed. (c) If 3.00 g of butan‑2‑one is actually obtained, determine the percent yield.

Answer Options

A. Limiting reagent: K₂Cr₂O₇; theoretical mass of butan‑2‑one = 3.68 g; percent yield = 75.0 %
B. Limiting reagent: K₂Cr₂O₇; theoretical mass of butan‑2‑one = 3.20 g; percent yield = 93.8 %
C. Limiting reagent: C₄H₁₀O; theoretical mass of butan‑2‑one = 4.12 g; percent yield = 72.8 %
Correct Answer D. Limiting reagent: K₂Cr₂O₇; theoretical mass of butan‑2‑one = 3.68 g; percent yield = 81.6 %
Correct Answer
D
Correct Option:
Limiting reagent: K₂Cr₂O₇; theoretical mass of butan‑2‑one = 3.68 g; percent yield = 81.6 %

About This Question

This is Neco Model Questions Vol1 2023 Chemistry Question 21. It is one of the objective questions from the 2023 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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