The pair of compounds which cannot exist together in aqueous solution

1.	The pair of compounds which cannot exist together in aqueous solution are
Answer» `NaH_(2)PO_(4)` and `Na_(2)HPO_(4)` `Na_(2)O_(3)` and `NaHCO_(3)` NaOH and `NaH_(2)PO_(4)` `NaHCO_(3)` and NaOH. SOLUTION :A base (NaOH) and an acid SALT `(NaH_(2)SO_(4) " or "NaH_(2)PO_(4))` cannot EXIST TOGETHER in a solution.

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