First slide

Ionic equilibrium

Question

The pairs of compounds which cannot exist together in aqueous solution are

Moderate

A

NaH₂PO₄ and Na₂HPO₄
B

Na₂CO₃ and NaHCO₃
C

$NaOH and {NaH}_{2} {PO}_{4}$
D

${NaHCO}_{3} and NaOH$

Solution

NaOH is a strong base whereas NaH₂PO₄ is a salt of strong base (NaOH) and H₃PO₄ (weak acid). Hence, NaOH and NaH₂PO₄ do not exist together in aqueous solution.
NaOH is a strong base, whereas NaHCO₃ is a salt of strong base (NaOH) and weak acid (H2CO3). Hence NaOH and Na₂CO₃ . Hence NaOH and Na₂CO₃ do not exist together.

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