Choose the correct statement(s):
A. Beryllium oxide is purely acidic in nature.
B. Beryllium carbonate is kept in the atmosphere of `CO_(2)`.
C. Beryllium sulphate is readily soluble in water.
D. Beryllium shows anomalous behavior.
Choose the correct answer from the options given below:

Options

A. `A`, `B` and C only
B. `B`, `C` and D only`
C. `A `and `B` only`
D. `A` only`

Answer

To solve the question, we need to analyze each statement regarding beryllium and its compounds.

### Step-by-Step Solution:

1. **Statement A: Beryllium oxide is purely acidic in nature.**
- Beryllium oxide (BeO) is not purely acidic; it is amphoteric. This means it can react with both acids and bases. Therefore, this statement is **incorrect**.

2. **Statement B: Beryllium carbonate is kept in the atmosphere of CO₂.**
- Beryllium carbonate (BeCO₃) is thermally unstable and decomposes into beryllium oxide (BeO) and carbon dioxide (CO₂) when heated. To prevent this decomposition, beryllium carbonate is kept in an atmosphere of CO₂, which shifts the equilibrium back to the reactants. Thus, this statement is **correct**.

3. **Statement C: Beryllium sulphate is readily soluble in water.**
- Beryllium sulfate (BeSO₄) is indeed soluble in water. The small size of the beryllium ion leads to high hydration energy, which contributes to its solubility. Therefore, this statement is **correct**.

4. **Statement D: Beryllium shows anomalous behavior.**
- Beryllium exhibits anomalous behavior compared to other alkaline earth metals due to its small size and high ionization energy. This results in unique properties that differ from those of its group. Thus, this statement is **correct**.

### Conclusion:
The correct statements are B, C, and D. Therefore, the answer is **B, C, and D**.