Question

The alkaline earth metal nitrate that does not crystallise with water molecules is:

• A. $Sr(N{O}_3{)}_2$
• B. $Mg(N{O}_3{)}_2$
• C. $Ca(N{O}_3{)}_2$
• D. $Ba(N{O}_3{)}_2$

Answer 1

The correct option is D $Ba(N{O}_3{)}_2$

Smaller the size of the central atom, more the number of water molecules will be attracted to the central atom, that is, crystallise. Hence, $Ba(N{O}_3{)}_2$ is the answer as $B{a}^{2+}$ is larger in size.