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Question

An aqueous solution of carbonic acid (H2CO3) contains


A

(H2CO3) only

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B

H2CO3, H+, HCO3

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C

H2CO3, H+, HCO3, CO23

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D

H2CO3, CO2, H+, HCO3, CO23

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Solution

The correct option is D

H2CO3, CO2, H+, HCO3, CO23


The ionization happens through multiple steps. It never happens in a single step (for acids with more than one acidic Hydrogen atoms in a molecule)

H2CO3CO2 + H2O
H2CO3HCO3 + H+
HCO3-⇌CO32 + H+

Hence, d


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