QJEEAdv06Chd39f: JEE Advanced 2006 Chemistry - Class 12 JEEAdv06Chd39f Solution: The species present in solution when CO 2 is dissolved in water …

When carbon dioxide (CO₂) is dissolved in water, it undergoes a series of chemical reactions that result in various species being present in the solution. The reactions can be described as follows:

1. Carbon dioxide reacts with water to form carbonic acid:

$CO_2 + H_2O \rightleftharpoons H_2CO_3$

2. Carbonic acid can dissociate into a bicarbonate ion and a proton:

$H_2CO_3 \rightleftharpoons HCO_3^- + H^+$

3. Bicarbonate ion can further dissociate into a carbonate ion and a proton:

$HCO_3^- \rightleftharpoons CO_3^{2-} + H^+$

Based on these reactions, the species present in the solution when CO₂ is dissolved in water include CO₂, $H_2CO_3$ , $HCO_3^-$ , and $CO_3^{2-}$ . Thus, the correct option is:

Option A: CO₂, H₂CO₃, $HCO_3^-$ , $CO_3^{2-}$