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.
A:
B:
C:
D:
Correct Answer
D
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.
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