Question

Li does not resemble with other alkali metals in following properties:

• A. $L{i}_{2}C{O}_3$ decomposes into oxides while other alkali metal carbonates are thermally stable
• B. LiCl is predominantly covalent
• C. $L{i}_{3}N$ is formed, when Li metal is heated with $N_2$ gas
• D. all are correct

Answer 1

Answer: (D)

all are correct

As lithium is less basic than other alkali metals so lithium carbonate decomposes into its oxide on heating unlike other elements.
$L{i}_{2}C{O}_3\stackrel{\Delta }{\to }L{i}_{2}O+C{O}_2$
Also LiCl is covalent in nature so it doesn't provide any ions in molten state and its molten state is non conductive and due to this nature it dissolves in ether.
Also Li forms $L{i}_{3}N$ but none other element from group 1 forms a nitride.