Question

The pair of compound which cannot exist together in solution is

• A. $NaHCO_3$ and $NaOH$
• B. $NaHCO_3$ and $H_2O$
• C. $NaHCO_3$ and $Na_2CO_3$
• D. $Na_2CO_3$ and $NaOH$

Answer 1

Answer: (A)

$NaHCO_3$ and $NaOH$

Answer 2

$NaHCO _{3}$ and $NaOH$ compounds cannot exist together in solution as

$NaHCO_3 +NaOH \to \underset{\text{Neutral salt}}{{Na_2CO_3}}+H_2O$

If acid and base present in same solution then they would react and $NaHCO _{3}$ is a slightly acidic compound, while $NaOH$ is a base. H-atom of $NaHCO _{3}$ replace by base, i.e. $NaOH$, give $Na _{2} CO _{3}$ and water