Question

____________ does not exist in solid state.

• A. ${\mathrm{LiHCO}}_3$
• B. ${\mathrm{NaHSO}}_3$
• C. ${\mathrm{CaCO}}_3$
• D. ${\mathrm{NaHCO}}_3$

Answer 1

The correct option is A

${\mathrm{LiHCO}}_3$

Correct option explanation:

(A) Hydration enthalpy (ꕔH_Hyd) is the change in enthalpy when one mole of gaseous ion under a standard condition of 1 bar pressure dissolves in a sufficient amount of water to form an infinitely dilute solution.

${\mathrm{LiHCO}}_3$ containing ${\mathrm{Li}}^{+}$ cations has the highest hydration enthalpy, So, it does not exist in solid-state.

Incorrect option explanation:

Options (B), (C), and (D) are having generally low hydration enthalpy and can exist in solid-state.

Thus, due to the high hydration enthalpy, option (A) ${\mathrm{LiHCO}}_3$ is the correct option.