Assertion : As the electropositive character increases down the group, the stability of carbonates and hydrogen carbonates of alkali metals increases.
Reason : Lithium carbonates is not so stable to heat : lithium being very small in size polarises a large ion leading to the formation of more stable and
(B). (i) Bigger cation stabilises bigger anions and vice-versa.
(ii) Alkali metal carbonates and their bicarbonates stability of their oxides to which they are converted.