Chemistry - s Block Elements Question with Solution | TestHub

$\text{A}\stackrel{\text{burns,}\text{nitrogen}}{\to }\underset{\text{ionic}\text{compound}}{\text{B}}\stackrel{{\text{H}}_{\text{2}}\text{O}}{\to }\underset{\text{milky}\text{solution}}{\text{C}}\text{+}\text{D}\stackrel{{\text{CO}}_{\text{2}}}{\to }$
Since the solution of C becomes milky on bubbling$\mathrm{C}{\mathrm{O}}_2$into it, C is lime water$(\mathrm{C}\mathrm{a}\left(\mathrm{O}\mathrm{H}{)}_2\right).$Thus, the element A is calcium and B is the compound of calcium with nitrogen. Nitrides on reacting with water give the corresponding hydroxide and ammonia. Therefore,
A is calcium (Ca)
B is calcium nitride$\left(\mathrm{C}{\mathrm{a}}_3{\mathrm{N}}_2\right)$.
C is lime water$\mathrm{C}\mathrm{a}{\left(\mathrm{O}\mathrm{H}\right)}_2$
D is ammonia$\left(\mathrm{N}{\mathrm{H}}_3\right)$.
$\text{Ca}\stackrel{\text{burns,}\text{nitrogen}}{\to }\underset{\text{ionic}\text{compound}}{{\text{Ca}}_3{\text{N}}_2}\stackrel{{\text{H}}_2\text{O}}{\to }\underset{\text{milky}\text{solution}}{\text{Ca}{(\text{OH})}_2}+{\text{NH}}_3\stackrel{{\text{CO}}_2}{\to }{\text{CaCO}}_3$