Shamli took a piece of burning charcoal and collected the gas evolved in a test tube. The gas settled at the bottom of the test tube. Which of the following observations is correct?

Gas evolved is acidic & heavier than air.

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Gas evolved is basic & heavier than air.

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Gas evolved is basic & lighter than air.

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Gas evolved is acidic & lighter than air.

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Solution

The correct option is A Gas evolved is acidic & heavier than air.
Burning charcoal in the presence of air produces carbon dioxide gas. $C O_{2}$ is denser than air and settles at the bottom of the test tube. Carbon is a nonmetal, its oxide is acidic in nature. If a moist blue litmus paper is introduced, it will turn red confirming that $C O_{2}$ is acidic.

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