Which of the following alkali metal carbonate is the least stable and decomposes readily

Options

A. `Cs_(2)CO_(3)`
B. `Na_(2)CO_(3)`
C. `K_(2)CO_(3)`
D. `Rb_(2)CO_(3)`

Answer

D

Explanation

As the size of the cation increases , M-O bond weakens and C-O bond strengthens . Since `Li^(+)` has the smallest size among alkali metals , therefore , Li-O bond is the strongest and C-O bond is the weakest . As a result , `Li_(2)CO_(3)` decomposers most readily to give `Li_(2)O` and `CO_(2)`.