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What is the total number of diprotic aci...

What is the total number of diprotic acid among the following ?
`H_3PO_4, H_2SO_4, H_3,PO_3,H_2CO_3,H_2 S_2O_7,H_3 BO_3, H_3 PO_2, H_2 CrO_4, H_2 SO_3`.

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Verified by Experts

The correct Answer is:
`(6)`
The total number of diprotic acids among the following are :
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