WHAT IS THE BASICITY OF CARBONIC ACID?​

H2CO3- 2 , It all depends on how much hydrogen atoms the acid has.

Dissociation equation of  carbonic acid : 
H2CO3 --> 2H+ (aq) + CO3- 2 (aq)

Here, two ​replaceable hydrogen ions, so it is dibasic
Remember basicity is the number of replaceable hydrogen ions in the acid molecule.

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Basicity of an acid means the number of hydrogen atoms present in an acid..... Therefore the basicity of carbonic acid which is H2CO3 is 2. It means that there are 2 hydrogen atoms in carbonic acid(H2CO3).
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It's 2
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