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 :

Options

A. Na and Rb
B. Na and Ca
C. Cs and Ba
D. Li and Mg

Answer

D

Explanation

Li and Mg do not form solid bicarbonate. But react with `N_2` to give nitrides.
`6Li + N_2 overset(Delta)to 2Li_3 N`
`3Mg + N_2 overset(Delta)to Mg_3 N_2`