Question

"The tendency of Li and Mg to form nitrides is such that Li forms nitride whereas Mg does not."
Answer whether the above statement is true or false.
If true enter 1, else enter 0.

Answer 1

The statement is false.

Both $Li$ and $Mg$ form nitrides; $L{i}_{3}N$ and $M{g}_3{N}_2$ respectively.

Lithium is the only alkali metal (group 1) to form a nitride when burnt in air. (This is however common with the alkaline earth metals (group 2).

Because $L{i}_{3}N$ is covalent and as the metallic character increases ,the tendency of donating electron and forming ionic bond increases due to which, strength of metal nitrogen bond decreases.