Question

Which of the following is themally least stable ?

• A. $BeC{O}_3$
• B. $N{a}_{2}C{O}_3$
• C. $BaC{O}_3$
• D. $MgC{O}_3$

Answer 1

The correct option is A $BeC{O}_3$

Thermal stability decreases with increase in polarising power of cation and on moving down the group the thermal stability of carbonates increases. Among these $BeC{O}_3$ is least stable.