Question

Which of the following option is/are correct?

• A. BeO is insoluble in water but $BeS{O}_4$ is soluble in water
• B. BaO is soluble in water but $BaS{O}_4$ is insoluble in water
• C. KI is more soluble than LiI in ethanol
• D. $NaHC{O}_3$ is isolated in solid state but $Ca(HC{O}_3{)}_2$ is not isolated in solid state

Answer 1

Answer: (A), (B), (D)

BeO is insoluble in water but $BeS{O}_4$ is soluble in water
$NaHC{O}_3$ is isolated in solid state but $Ca(HC{O}_3{)}_2$ is not isolated in solid state
BaO is soluble in water but $BaS{O}_4$ is insoluble in water

(A) BeO is insoluble (as lattice energy is higher than hydration energy) but $BeS{O}_4$ is soluble in water (as hydration energy is larger than lattice energy).
(B) BaO is soluble (as hydration energy is larger than lattice energy) but $BaS{O}_4$ is insoluble in water(as lattice energy is higher than hydration energy).
(C) KI is less soluble than LiI in ethanol. LiI is more covalent in nature than KI and hence, LII is more soluble in non-polar solvents.
(D) $NaHC{O}_3$ is isolated in solid state but $Ca(HC{O}_3{)}_2$ is not isolated in solid state. Calcium bicarbonate exists only in aqueous solution containing the calcium ($C{a}^{2+}$), bicarbonate (${HC{O}_3}^{-}$), and carbonate (${C{O}_3}^{2-}$) ions, together with dissolved carbon dioxide ($C{O}_2$).