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Assertion (A) The carbonate of lithium d...

Assertion (A) The carbonate of lithium decomposes easily on heating to form lithium oxide and `CO_(2)`.
Reason (R) Lithium being very small in size polarises large carbonate ion leading to the formation of more stable `Li_(2)O` and `CO_(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

Text Solution

Verified by Experts

The correct Answer is:
A
The thermal stability of carbonates increases down the group. Hence `Li_(2)CO_(3)` is least stable. Due to small size of `Li^(+)`, strong polarising power distorts the electron cloud of `CO_(3)^(2-)` ion. High lattice energy of `Li_(2)O` than `Li_(2)CO_(3)` also favours the decomposition of `Li_(2)CO_(3)`.
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Knowledge Check

  • 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 Li_(2)O and CO_(2) .

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Which of the following decomposes to form lithium oxide, Li_(2)O ?

    A
    `LiOH`
    B
    `Li_(2)CO_(3)`
    C
    `LiNO_(3)`
    D
    all of these

  • Assertion : Lithium forms lithium oxide (LiO_(2)) Reason : N_(2) molecule have unpaired electrons

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion
    B
    If both assertion and reason are true but reason is nto the correct exaplation of the assertion
    C
    If assertion is true but reason is false
    D
    If the assertion and reason both are false

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    Which of the following carbonate decompose on heating to evolve CO_(2) ?

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