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The total no. of diprotic acids among th...

The total no. of diprotic acids among the following is `H_(3)PO_(4), H_(2)SO_(4), H_(3)PO_(3), H_(2)S_(2)O_(7), H_(3)BO_(3), H_(3)PO_(2), H_(2)CrO_(4), H_(2)SO_(3), H_(2)CO_(3)`

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The correct Answer is:
6
`H_(2)SO_(4), H_(3)PO_(3), H_(2)S_(2)O_(7), H_(2)SO_(3), H_(2)CrO_(4), H_(2)CO_(3)`
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