####72. The total number of diprotic acids among the following is
| $H _3 PO _4$ | $H _2 SO _4$ | $H _3 PO _3$ |
|---|---|---|
| $H _2 CO _3$ | $H _2 S _2 O _7$ | $H _3 BO _3$ |
| $H _3 PO _2$ | $H _2 CrO _4$ | $H _2 SO _3$ |
(2010)
Others are
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