Which of the following gas will not burn, is not very soluble in water, and makes a weakly acidic solution?

O_{2}

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C O_{2}

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N_{2}

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H_{2}

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Solution

The correct option is C $C O_{2}$
Option B is the correct answer.
$C O_{2}$ is not very soluble in water. Even when it dissolves in water, it produces a weakly acidic solution of Carbonic Acid.
$H_{2} O$ + $C O_{2}$ $\to$ $H_{2} C O_{3}$
Carbonic acid is a weak acid. It dissociates as $H^{+}$ and $H C O_{3}^{-}$ .

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