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Q. The species present in solution when $CO _{2}$ is dissolved in water are:

The p-Block Elements

Solution:

$CO _{2}+ H _{2} O \rightleftharpoons H _{2} CO _{3} \rightleftharpoons H ^{\oplus}+ HCO _{3}^{\ominus} \rightleftharpoons 2 H ^{+}+ CO _{3}^{2-}$

Hence, species present in solution are:

$CO _{2} H _{2} CO _{3}, HCO _{3}^{\ominus}, CO _{3}^{2-}$