Alkaline earth metal carbonates are decomposed on heating and produce residue. Thermal stability of reactant and residue will be - On moving down the group :-

Options

A. Increases and decreases respectively
B. Decreases and increases respectively
C. Increases and increases
D. Decreases and decreases

Answer

A

Explanation

`MCO_(3) overset(Delta)to MO+CO_(2)`
down the group, stability of carbonate `(uarr)`
stability of oxide `(darr)`