Which of the following statements is/are correct .

Options

A. Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
B. Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of `Be^(2+)` overcomes the lattice enthalpy factor.
C. Beryllium exhibits coordination number more than four.
D. Beryllium oxide is purely acidic in nature.

Answer

To determine which statements regarding beryllium and its compounds are correct, we will analyze each statement one by one.

### Step 1: Analyze Statement A
**Statement A:** "Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal."

**Analysis:**
- Beryllium does indeed form a protective oxide layer (beryllium oxide, BeO) on its surface when exposed to air.
- This oxide layer prevents further reaction with acids, making beryllium resistant to acid attack.
- Therefore, this statement is **correct**.

### Step 2: Analyze Statement B
**Statement B:** "Beryllium Sulfate is readily soluble in water as greater the Hydration Enthalpy of B²⁺ overcomes the Lattice Enthalpy Factor."

**Analysis:**
- Beryllium ions (Be²⁺) are small and have a high charge density, which results in a high hydration enthalpy.
- The high hydration enthalpy can indeed overcome the lattice enthalpy of beryllium sulfate, making it soluble in water.
- Thus, this statement is also **correct**.

### Step 3: Analyze Statement C
**Statement C:** "Beryllium exhibits coordination number more than 4."

**Analysis:**
- Beryllium typically has a coordination number of 4 due to its electronic configuration and the absence of d-orbitals.
- It cannot utilize d-orbitals for bonding, which limits its coordination number.
- Therefore, this statement is **incorrect**.

### Step 4: Analyze Statement D
**Statement D:** "Beryllium oxide is purely acidic in nature."

**Analysis:**
- Beryllium oxide (BeO) is amphoteric, meaning it can react with both acids and bases.
- It does not exhibit purely acidic behavior; rather, it can neutralize both acids and bases.
- Hence, this statement is also **incorrect**.

### Conclusion
Based on the analyses:
- **Correct Statements:** A and B
- **Incorrect Statements:** C and D

### Final Answer
The correct statements are A and B.

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