Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A): The carbonate of Lithium decomposes easily on heating to form lithium oxide and $C O_{2.}$
Reason (R) : Lithium being very small polarizes large carbonate leading to the formation of more stable $L i_{2} O$ and $C O_{2.}$
In light of the above statements, choose the correct answer from the options given below.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

Both (A) and (R) are false.

answer is A.

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Detailed Solution

The thermal Stability of carbonates increases down the group. Hence $L i_{2} C O_{3}$ is the least stable Due to small size of $L i^{+}$ Strong polarizing power distorts the electron cloud of $C {O_{3}}^{2 -}$ High lattice energy of ${Li}_{2} O$ than ${CO}_{2}$ Also favors the decomposition of ${Li}_{2} {CO}_{3}$