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 polarizes a large ion leading to the formation of more stable and .
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(B) (i) Bigger cation stabilises bigger anions and vice-versa.
(ii) Alkali metal carbonates and their bicarbonates stabilities depend on their metallic character.
Stability of carbonates and bicarbonates Metallic character of their i.e. electropositive character.