Neco 2021 Chemistry Question 16

Practice objective / multiple choice question 16 from the 2021 Neco Chemistry examination.

Neco 2021 Chemistry Objective / Multiple Choice Hard Difficulty
Question 16 NECO • 2021 • CHEMISTRY • objective

A metal X is extracted from its ore by the reduction reaction \( \text{X}_2\text{O}_3 + 3C \rightarrow 2X + 3CO \). A 150.0 g sample of the ore contains 68.0 % \( \text{X}_2\text{O}_3 \) by mass; the remainder is inert impurity. The atomic mass of X is 55.8 g mol\(^{-1}\). After reduction, 12.5 g of metal X is obtained.\n(a) Calculate the percent efficiency of the reduction process.\n(b) The metal X is to be alloyed with metal Y in a mass ratio X : Y = 3 : 2. If 20.0 g of X is available, determine the mass of Y required and the total mass of the alloy produced.

Answer Options

Correct Answer A. Percent efficiency = 17.5 %; mass of Y = 13.3 g; mass of alloy = 33.3 g
B. Percent efficiency = 8.3 %; mass of Y = 10.0 g; mass of alloy = 30.0 g
C. Percent efficiency = 17.5 %; mass of Y = 8.3 g; mass of alloy = 28.3 g
D. Percent efficiency = 12.3 %; mass of Y = 13.3 g; mass of alloy = 25.6 g
Correct Answer
A
Correct Option:
Percent efficiency = 17.5 %; mass of Y = 13.3 g; mass of alloy = 33.3 g

About This Question

This is Neco 2021 Chemistry Question 16. It is one of the objective questions from the 2021 Neco Chemistry examination.

Difficulty level: Hard .

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