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CHEMISTRY

JAMB 2011 - Question 35

Chemistry 2011 JAMB Past Questions - Question 35: In the laboratory preparation of oxygen, dried oxygen is usually collected over

Choose the correct answers from the options given.

In the laboratory preparation of oxygen, dried oxygen is usually collected over

A: hydrochloric acid

B: mercury

C: calcium chloride

D: tetraoxosulpnate (VI) acid.

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Correct Answer

Explanation

In the laboratory preparation of oxygen, dried oxygen is usually collected over dried tetraoxosulfate(VI) acid (sulfuric acid). This is because tetraoxosulfate(VI) acid has a strong affinity for water and is effective at drying gases. By passing the oxygen through dried tetraoxosulfate(VI) acid, any remaining moisture in the gas is removed, ensuring that the collected oxygen is dry.