Assertion : The carbonate of lithium decomposes easily on heating to form lithium oxide and $C O_{2}$ .
Reason : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable $L i_{2} O$ and $C O_{2}$ .

Assertion is true but reason is false

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Both assertion and reason are true and reason is the correct explanation of assertion

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Both assertion and reason are false

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Both assertion and reason are true but reason is not the correct explanation of assertion

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Solution

The correct option is B Both assertion and reason are true and reason is the correct explanation of assertion
The carbonate of lithium decomposes easily on heating to form lithium oxide and $C O_{2}$ . Other alkali metal carbonates do not decompose.
$L i_{2} C O_{3} Δ - \to L i_{2} O + C O_{2} ↑$

Lithium being very small in size polarises large carbonate ion. It distorts the electron cloud on the nearby oxygen atom of large carbonate ion. It weakens $C - O$ bond and strengthens $L i - O$ bond. It leads to the formation of more stable $L i_{2} O$ and $C O_{2}$ .

Hence, option (a) is correct.

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Similar questions

Q. Assertion :The carbonate of lithium decomposes easily on heating. Reason: Lithium being very small in size polarises large carbonate ion leading to the formation of more stable

L i_{2} O

and

C O_{2}

Q. Assertion :As the electropositive character increases down the group, the stability of carbonates and hydrogen carbonates of alkali metals increases. Reason: Lithium carbonates are not so stable to heat: lithium being very small in size polarises a large

C O_{3}^{2 -}

leading to the formation of more stable

L i_{2} O

and

C O_{2}

In the following question, a statement fo Assertion (A) followed by a statement fo Reason (R ) is given. Choose the correct option out of the choices given below in each question
Assertion (A) the carbonate of lithium decomposes easily on heating to form lithium oxide and $C O_{2}$
Reason (R) Lithium being very small in size polarises large carbonate ion leading to the formation of more stable $L i_{2} O a n d C O_{2}$
(a) Both A and R are correct and R is the correct Explanation of A
(b) Both A and R are correct but R is not the correct explanation Of A
(c) Both A and R are not Correct
(d) A is not correct but R is correct

Q. Assertion :Lithium does not form alums. Reason: Small

[L i (H_{2} O)_{6}]^{+}

is too small to form a stable lattice required for alum formation.

Q. Assertion :In the preparation of barium oxide by thermal decomposition of barium carbonate, carbon is added to the reaction mixture. Reason: Barium carbonate due to very high lattice energy decomposes at about

1400^{\circ} C . B a C O_{3} \to B a O + C O_{2}

At such high temperature, the reaction tends to become reversible. Carbon added combines with

C O_{2}

forming CO and thus reaction is made irreversible

C O_{2} + C \to 2 C O

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Assertion : The carbonate of lithium decomposes easily on heating to form lithium oxide and CO2. Reason : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li2O and CO2.

Assertion : The carbonate of lithium decomposes easily on heating to form lithium oxide and $C O_{2}$ .
Reason : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable $L i_{2} O$ and $C O_{2}$ .