Q38 / 125 · BITSAT 2021 · Chemistry
Two elements $A$ and $B$ have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are :
- A$Na$ and $Rb$
- B$Na$ and $Ca$
- C$Cs$ and $Ba$
- Correct answerD$Li$ and $Mg$
Solution
Li and $\mathrm{Mg}$ do not form solid bicarbonate, but react with $\mathrm{N}_{2}$ to give nitrides.
$\begin{array}{l}
6 \mathrm{Li}+\mathrm{N}_{2} \stackrel{\Delta}{\rightarrow} 2 \mathrm{Li}_{3} \mathrm{~N} \\
3 \mathrm{Mg}+\mathrm{N}_{2} \stackrel{\Delta}{\rightarrow} \mathrm{Mg}_{3} \mathrm{~N}_{2}
\end{array}$
Hence, the correct answer is option: 'D'.