The pair of compounds which cannot exist together in aqueous solution are:a) NaH2PO4 & Na2HPO4b) Na2CO3 & NaHCO3c) NaOH & NaH2PO4d) NaHCO3 & NaOH

Dear student,

baking soda is sodium bicarbonate NaHCO3;
Na2CO3 is commonly called washing soda.

The correct option is b) these  two cannot exist together..

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