Question

Among the following the least thermally stable is:

• A. $K_{2}C{O}_3$
• B. $N{a}_{2}C{O}_3$
• C. $BaC{O}_3$
• D. $L{i}_{2}C{O}_3$

Answer 1

The correct option is D $L{i}_{2}C{O}_3$

Thermal stability of carbonates increases on moving down a group. Thus, lithium carbonate, $L{i}_{2}C{O}_3$ is least thermally stable.
$L{i}_{2}C{O}_3\stackrel{△}{\to }L{i}_{2}O+C{O}_2\uparrow$.