Question

Consider the following statements and pick out the wrong one.
1) The solubility, thermal stability and the basic character of the hydroxides of alkaline earth metals increases from $Mg(OH{)}_2$ to $Ba(OH{)}_2$
2) The dehydration of hydrated chlorides, bromides and iodides of $Ca,Sr$ and $Ba$ can be achieved on heating
3) The chlorides of both beryllium and aluminium are soluble in organic solvents and are used as Lewis acids.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (1), (2) and (3)
• D. None

Answer 1

The correct option is D None

(1) The solubility increases down the group because the change in lattice energy is more as compared to hydration energy. Thermal stability and the basic character both increases down the group as metallic character increases.
(2) Dehydration of hydrated salts are done by heating so it is a correct statement.
(3) Beryllium and aluminium are diagonally related. Chlorides of both are covalent in nature and thus are soluble in organic solvents. Chlorides of both are electron deficient and thus act as strong Lewis acids.