The total number of diprotic acids among the following is: H2SO4, H2CrO4, H3PO3, H2SO3, H3BO3, H2S2O7, H3PO4. ___
H2SO4, H2CrO4, H3PO3, H2SO3, H2S2O7
1 mole of how many of the following acids neutralize exactly one mole of NaOH, under required favorable conditions? HCl,HNO3,H2SO4,H2SO3,H3PO4,H3PO3,H3PO2,H4P2O5,H3BO3___