Question

$Li$ does not resemble other alkali metals in which of the 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 stable
• D. All of the above

Answer 1

The correct option is D All of the above

(A) $L{i}_{2}C{O}_3\stackrel{\Delta }{\to }L{i}_{2}O+C{O}_2$
$M_{2}C{O}_3\stackrel{\Delta }{\to }\text{no reaction}$
$(M=Na/K/Rb/Cs)$
(B) $L{i}^{+}C{l}^{-}\to$ Covalent because of high polarising power of $L{i}^{+}$ and high polarisability of $C{l}^{-}$.
(C) $L{i}_{3}N\to L{i}^{+}{N}^{3-}$ stable, but other group 1 elements cannot form stable nitrides.