Question

Thermally most stable carbonate among the following is
1) MgCO3
2)K2CO3
3)Li2CO3
4)CaCO3
also, give the reason

Answer 1

Answer: Option (2) is the correct answer.

Explanation:

It is known that thermal stability increases with increase in size of cation. Since, size of cations increases on moving down the group therefore, there will be increase in thermal stability down the group.

Whereas size of atoms decrease across a period on moving from left to right. Therefore, there will be decrease in thermal stability from left to right across a period.

Thus, we can conclude that out of the given options $K_{2}CO_{3}$ is thermally most stable carbonate.

Answer 2

Answer:

2nd

Explanation:

Down gp stability increase