Question

The correct order of increasing thermal stability of $K_{2}C{O}_3,MgC{O}_3,CaC{O}_{3}andBeC{O}_3$ is:

• A. $K_{2}C{O}_3<MgC{O}_3<CaC{O}_3<BeC{O}_3$
• B. $BeC{O}_3<MgC{O}_3<K_{2}C{O}_3<CaC{O}_3$
• C. $BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$
• D. $MgC{O}_3<BeC{O}_3<CaC{O}_3<K_{2}C{O}_3$

Answer 1

The correct option is C $BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$

The thermal stability of carbonates increases in a group, as we move from top to bottom and decreases in a period as we move from left to right. In the above set, $Be,Mg,Ca$ is present in second group, $K$ is present in first group.

So, the correct order of increased thermal stability is:

$BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$