Question

Which of the following compounds do not give ammonia on reaction with water?

• A. ${Mg}_3{N}_2$
• B. $AlN$
• C. $CaC{N}_2$
• D. $Ca{\left(CN\right)}_2$

Answer 1

Answer: (D)

$\text{Let's see, what happens:}$

$\text{when the given, compounds react with water}$

${Mg}_2{N}_2+6H_{2}O⟶2Mg(OH{)}_2+2{NH}_3$

$AlN+3H_{2}O⟶{NH}_3+Al(OH{)}_3$

$\begin{array}{c}Ca(CN{)}_2+2H_{2}O⟶Ca(OH{)}_2+2HCN\\ {CaCN}_2+3H_{2}O⟶{CaCO}_3+2{NH}_3\end{array}$

$\begin{array}{c}\text{Herce, only}Ca(CN{)}_2\text{doesn't give}{NH}_3\text{, on reaction with water.}\\ \text{So, option(D) is correct.}\end{array}$