Question
The correct order of increasing thermal stability of $${K_2}C{O_3},MgC{O_3},CaC{O_3}$$ and $$BeC{O_3}$$ is
A.
$$BeC{O_3} < MgC{O_3} < {K_2}C{O_3} < CaC{O_3}$$
B.
$$BeC{O_3} < MgC{O_3} < CaC{O_3} < {K_2}C{O_3}$$
C.
$$MgC{O_3} < BeC{O_3} < CaC{O_3} < {K_2}C{O_3}$$
D.
$${K_2}C{O_3} < MgC{O_3} < CaC{O_3} < BeC{O_3}$$
Answer :
$$BeC{O_3} < MgC{O_3} < CaC{O_3} < {K_2}C{O_3}$$
Solution :
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, so the correct order of thermal stability of given carbonates is $$BeC{O_3} < MgC{O_3} < CaC{O_3} < {K_2}C{O_3}$$
$$Be, Mg$$ and $$Ca$$ are present in second group and $$K$$ is present in first group.