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Find the total number of diprotic acids ...

Find the total number of diprotic acids among the following :
`H_(3)PO_(4), H_(2)SO_(4), H_(3)PO_(3), H_(3)CO_(3), H_(2)S_(2)O_(4), H_(3)BO_(3), H_(3)PO_(2), H_(2)SO_(3)`

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The correct Answer is:
6
Diprotic acids are those which furnish two protons per molecule.
`H_(2)SO_(4) , H_(3)PO_(3), H_(2)CO_(3), H_(2)S_(2)O_(7), H_(3)CrO_(4), H_(2)SO_(3)`
`H_(3)BO_(3) + H_(2)O rarr B(OH)_(4)^(ɵ) + H^(ɵ)` (Monobasic), `H - O-underset(O)underset(||)overset(O)overset(||)(S)-O-underset(O)underset(||)overset(O)overset(||)(S)-O-H` (Dibasic) `(H_(2)S_(2)O_(7))`
Only those hydrogens are replacable from acids of phosphorous acid sulphur which are attached to oxygen `H_(3)PO_(4)` (Tribasic), `H_(3)PO_(3)` (Dibasic), `H_(3)PO_(2)` (Monobasic)
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