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The pair of compounds which cannot exist together in aqueous solution is :
(I) \( \mathrm{NaH}_{2} \mathrm{PO}_{4} \) and \( \mathrm{NaHCO}_{3} \)
(II) \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) and \( \mathrm{NaHCO}_{3} \)
(III) \( \mathrm{NaOH} \) and \( \mathrm{NaH}_{2} \mathrm{PO}_{2} \)
(IV) \( \mathrm{NaHCO}_{3} \) and \( \mathrm{NaOH} \)
(a) I, II, III
(b) II, III
(c) III, IV
(d) only IV
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