Given below are two statements :

Question:

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Barium carbonate is insoluble in water and is highly stable.

Reason (R) : The thermal stability of the carbonates increases with increasing cationic size.

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

  2. (A) is true but $\mathbf{( R )}$ is false

  3. Both $(\mathbf{A})$ and $\mathbf{( R )}$ are true and $\mathbf{( R )}$ is not the true explanation of (A)

  4. (A) is false but $\mathbf{( R )}$ is true.

Correct Option: 1

Solution:

In IIA group on moving down the group size of cation increases and show thermal stability of carbonate increases.

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