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 $C O_{2}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
As the electropositive character increases down the group, the stability of carbonates and hydrogen carbonates of alkali metals increases because as we move down the metallic character increases and forms stable $C O_{3}^{2 -}$ and $H C O_{3}^{-}$

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Similar questions

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 :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 : 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 (A) Phenol forms 2, 4, 6-tribromophenol on treatment with $B r_{2}$ in carbon disulphide at 273K.
Reason (R) Bromine polarises in carbon disulphide.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion

Lithium sulphate does not form alums.

Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

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