Question:
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 :
Correct Option: , 2
Solution:
Both $\mathrm{Li}$ and $\mathrm{Mg}$ form nitride when reacts directly with nitrogen.
The hydrogen carbonate of both $\mathrm{Li}$ and $\mathrm{Mg}$ does not exist in solid state.
All alkali metal hydrogen carbonate exist in solid state except $\mathrm{LiHCO}_{3}$.