The pair of compounds which can exist together in aqueous solution is

The pair(s) of compounds which can exist together in aqueous solution is/are ?

The pair of compounds which cannot exist together in aqueous solution is: (I) NaH_(2)PO_(4) and NaHCO_(3)" "(II) Na_(2)CO_(3) and NaHCO_(3) (III) NaOH and NaH_(2)PO_(2)" "(IV) NaHCO_(3) and NaOH

The pair of compounds which cannot exist together in aqueous solution is: (I) NaH_(2)PO_(4) and NaHCO_(3)" "(II) Na_(2)CO_(3) and NaHCO_(3) (III) NaOH and NaH_(2)PO_(2)" "(IV) NaHCO_(3) and NaOH

The pairs of compounds which cannot exist together in aqueous solution are

The pairs of compounds which cannot exist together in aqueous solution are