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CHEMISTRY

JAMB 2003 - Question 31

Chemistry 2003 JAMB Past Questions - Question 31: Chlorine gas is prepared in the laboratory by

Choose the correct answers from the options given.

Chlorine gas is prepared in the laboratory by

A: adding concentrated hydrochloric acid to solid manganese (IV) oxide.

B: adding concentrated tetraoxosulphate (VI) acid to solid sodium chloride

C: dropping concentrated hydrochloric acid onto potassium tetraoxomanganate crystals.

D: dropping concentrated hydrochloric acid onto potassium tetraoxomanganate (VI) crystals.

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Correct Answer

Explanation

The correct statement for the preparation of chlorine gas in the laboratory is:

**Dropping concentrated hydrochloric acid onto potassium tetraoxomanganate (VI) crystals.**

This reaction involves the reaction between concentrated hydrochloric acid (HCl) and potassium permanganate (KMnO₄). The balanced chemical equation for the reaction is:

\[ 2 \text{KMnO}_4 + 16 \text{HCl} \rightarrow 2 \text{MnCl}_2 + 5 \text{Cl}_2 + 8 \text{H}_2\text{O} \]

In this reaction, chlorine gas (Cl₂) is evolved along with other products.