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When acidified KMnO4 reacts with concentrated HCl, water and a gas X are produced. The gas X is:

1. a red liquid
2. a violet gas
3. a greenish-yellow gas
4. a yellow-brown gas

Correct answer: a greenish-yellow gas

Solution

KMnO4 oxidises HCl to chlorine gas, Cl2, which is greenish-yellow.

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