Question

Which of the following alkali carbonates have high thermal stability?

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

Answer 1

The correct option is D $R{b}_{2}C{O}_3$

As the electropositive character increase down the group, the stability of alkali carbonates increases. Hence more thermal energy required for the decomposition of alkali carbonates down the group. Hence, $R{b}_{2}C{O}_3$ have more thermal stability than others.