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Question:

The total number of diprotic acids among the following is: H3PO4, H2SO4, H3PO3, H2CO3, H2S2O7, H3BO3, H3PO2, H2CrO4, H2SO3

6

5

2

4

Solution:

A diprotic acid is an acid that contains within its molecular structure two hydrogen atoms per molecule capable of dissociating (i.e., ionizable) in water.
H2SO4, H2CO3, H2S2O7, H2CrO4, H3PO3, H2SO3