Neco 2022 Chemistry Question 8

Practice objective / multiple choice question 8 from the 2022 Neco Chemistry examination.

Neco 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 8 NECO • 2022 • CHEMISTRY • objective

2.00\,g of aluminium metal is placed in excess hydrochloric acid. The reaction is 2 Al + 6 HCl \rightarrow 2 AlCl_{3} + 3 H_{2}. (a) Calculate the volume of hydrogen gas produced at STP if the reaction went to completion. (b) In practice only 75\% of the aluminium reacts because of surface passivation. Re‑calculate the volume of hydrogen actually evolved. (c) Determine the mass of aluminium chloride formed under the same 75\% conversion condition.

Answer Options

A. Theoretical H_{2} volume = 2.55\,L; actual H_{2} volume = 1.90\,L; mass of AlCl_{3} formed = 7.20\,g
Correct Answer B. Theoretical H_{2} volume = 2.49\,L; actual H_{2} volume = 1.87\,L; mass of AlCl_{3} formed = 7.41\,g
C. Theoretical H_{2} volume = 2.60\,L; actual H_{2} volume = 1.95\,L; mass of AlCl_{3} formed = 7.80\,g
D. Theoretical H_{2} volume = 2.30\,L; actual H_{2} volume = 1.73\,L; mass of AlCl_{3} formed = 6.95\,g
Correct Answer
B
Correct Option:
Theoretical H_{2} volume = 2.49\,L; actual H_{2} volume = 1.87\,L; mass of AlCl_{3} formed = 7.41\,g

About This Question

This is Neco 2022 Chemistry Question 8. It is one of the objective questions from the 2022 Neco Chemistry examination.

Difficulty level: Medium .

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