Which of the following gas is absorbed by potassium hydroxide?

Carbon dioxide gas

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Oxygen gas

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Carbon monoxide

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All of the above

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Solution

The correct option is A Carbon dioxide gas
Potassium hydroxide solution absorbs $C O_{2}$ and $S O_{2}$ . Potassium hydroxide is an inorganic compound with the formula $K O H$ and is commonly called caustic potash. When excess $C O_{2}$ is absorbed by $K O H$ , $K H C O_{3}$ is formed which remains soluble in the solution.

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