Question

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas $\left(A\right)$ and an alkaline solution. The solution on exposure to air produces a thin solid layer of $\left(B\right)$ on the surface. Identify the compounds $\left(A\right)$ and $\left(B\right)$.

• A. $\left(A\right)-N{H}_3$ $\left(B\right)-CaC{O}_3$
• B. $\left(A\right)-N{H}_2$ $\left(B\right)-CaC{O}_2$
• C. $\left(A\right)-N{H}_4$ $\left(B\right)-CaC{O}_2$
• D. None of these

Answer 1

The correct option is A $\left(A\right)-N{H}_3$ $\left(B\right)-CaC{O}_3$

This may be explained by the above reactions.

Thus A is $N{H}_3$ and B is $CaC{O}_3$.