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Common Ion Effect

The reaction ...

Question

The reaction between alkali and $C O_{2}$ (g) is slow. Because -

A

small amount of $C O_{2}$ exist in aqueous solution as $H_{2} C O_{3}$

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B

inter conversions of hydrated $C O_{2}$ to various species are slower

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C

$O H^{-}$ repell the electron rich $C O_{2}$

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D

alkali and $C O_{2}$ both act as Lewis base

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Solution

The correct option is B
inter conversions of hydrated $C O_{2}$ to various species are slower

pH < 8, CO₂ reacts as follows
$C O_{2} + H_{2} O ⇌ H_{2} C O_{3} (s l o w) H_{2} C O_{3} + O H^{-} \to H C O_{3}^{-} + H_{2} O (f a s t) A t p H > 8, C O_{2} r e a c t s a s f o l l o w s C O_{2} + O H^{-} \to H C O_{3}^{-} (s l o w) H C O_{3}^{-} + O H^{-} \to C O_{3}^{-} + H_{2} O (f a s t)$
$\times C O_{3}^{-} \leftrightarrow C O_{3}^{2 -}$

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