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(D) Compounds that cannot exist together in an aqueous solution are those that react with each other via an acid-base reaction.$I$. $NaH_2PO_4$ (acidi

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only $IV$

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(D) Compounds that cannot exist together in an aqueous solution are those that react with each other via an acid-base reaction.$I$. $NaH_2PO_4$ (acidic salt) and $NaHCO_3$ (amphoteric salt) can coexist as they do not react significantly.$II$. $Na_2CO_3$ and $NaHCO_3$ can coexist in equilibrium in aqueous solution.$III$. $NaOH$ (strong base) and $NaH_2PO_2$ (salt of a weak acid and strong base) can coexist.$IV$. $NaHCO_3$ and $NaOH$ react to form $Na_2CO_3$ and $H_2O$:$NaHCO_3 + NaOH \rightarrow Na_2CO_3 + H_2O$.Therefore,they cannot exist together in solution.

The pair of compounds which cannot exist together in aqueous solution is
$I$. $NaH_2PO_4$ and $NaHCO_3$
$II$. $Na_2CO_3$ and $NaHCO_3$
$III$. $NaOH$ and $NaH_2PO_2$
$IV$. $NaHCO_3$ and $NaOH$

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The pair of compounds which cannot exist together in aqueous solution is$I$. $NaH_2PO_4$ and $NaHCO_3$$II$. $Na_2CO_3$ and $NaHCO_3$$III$. $NaOH$ and $NaH_2PO_2$$IV$. $NaHCO_3$ and $NaOH$