The pair of compounds which cannot exist together in aqueous solution is (a) \( \mathrm{Na}_{2} ...

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The pair of compounds which cannot exist together in aqueous solution is
(a) \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) and \( \mathrm{NaHCO}_{3} \)
(b) \( \mathrm{NaHCO}_{3} \) and \( \mathrm{NaOH} \)
(c) \( \mathrm{NaOH} \) and \( \mathrm{NaH}_{2} \mathrm{PO}_{4} \)
(d) \( \mathrm{NaOH}+\mathrm{Na}_{2} \mathrm{HPO}_{3} \)
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