NEET Chemistry The s-Block Elements Questions Solved

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 CO32-ion leading to the formation of more stable Li2O and CO2.

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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.

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