Question

$Li$ has an abnormal behaviour in its group, which is ____________.

• A. lithium carbonate decomposes into its oxide on heating unlike other elements.
• B. $LiCl$ is covalent in nature.
• C. $L{i}_{3}N$ is a stable compound.
• D. $LiCl$ is a good conductor of electricity in the molten state.

Answer 1

Answer: (A), (B), (C)

lithium carbonate decomposes into its oxide on heating unlike other elements.
$LiCl$ is covalent in nature.
$L{i}_{3}N$ is a stable compound.

(A). Lithium carbonate, being less stable, decomposes into its oxide on heating, whereas other group IA carbonates are stable and do not decompose.

${Li}_{2}C{O}_3\underrightarrow{△}{Li}_{2}O+C{O}_2$

(B). Lithium halides, except fluoride, are covalent due to fajan's rule.

(C) Lithium is the only 1A metal that can combine with inert nitrogen in air to form lithium nitride.

(D) Lithium chloride , like other alkali metals compounds , is a good conductor of electricity in molten state.