The species present in solution when $C O_{2}$ is dissolved in water are:

C O_{2}, H_{2} C O_{3}

H C O_{3}^{-}, C O_{3}^{2 -}

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H_{2} C O_{3}

C O_{3}^{2 -}

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C O_{3}^{2 -}, H C O_{3}^{-}

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C O_{2}, H_{2} C O_{3}

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Solution

The correct option is B $C O_{2}, H_{2} C O_{3}$ , $H C O_{3}^{-}, C O_{3}^{2 -}$
The species present in solution when CO $_{2}$ is dissolved in water are
$C O_{2}, H_{2} C O_{3}$ , $H C O_{3}^{-}, C O_{3}^{2 -}$
This is due to the following equilibria.
$C O_{2} + H_{2} O ⇌ H_{2} C O_{3}$
$H_{2} C O_{3} ⇌ H^{+} + H C O_{3}^{-}$
$H C O_{3}^{-} ⇌ H^{+} + C O_{3}^{2 -}$

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