Question

The reaction between alkali and CO₂(g) is slow. Because -

• A. Small amount of CO₂ exist in aqueous solution as H₂CO₃
• B. Inter conversions of hydrated CO₂ to various species are slower
• C. OH^– repell the electron rich CO₂
• D. Alkali and CO₂ both act as Lewis base

Answer 1

Answer: (B)

Inter conversions of hydrated CO₂ to various species are slower

Answer 2

pH < 8, CO₂ reacts as follows

CO₂ + H₂O $\rightleftarrows$H₂CO₃ (slow)

H₂CO₃ + OH^– ¾® HCO₃^– + H₂O (fast)

At pH > 8, CO₂ reacts as follows

CO₂ + OH^– ¾® HCO₃^– (slow)

HCO₃^– + OH^– ¾® CO₃^2– + H₂O (fast)