The alkaline earth metal sulphate(s) which are readily soluble in water is/are :
A.`BeSO _(4)`
B. `MgSO_(4)`
C. `CaSO_(4)`
D. `SrSO_(4)`
E. `BaSO_(4)`
Choose the correct answer from the options given below:

Options

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

Answer

To determine which alkaline earth metal sulfates are readily soluble in water, we need to analyze the solubility of the sulfates of the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba).

### Step-by-Step Solution:

1. **Identify the Alkaline Earth Metals**:
The alkaline earth metals include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba).

2. **Consider the Sulfates**:
We are looking at the sulfates of these metals:
- BeSO₄
- MgSO₄
- CaSO₄
- SrSO₄
- BaSO₄

3. **Understand Solubility Factors**:
The solubility of these sulfates in water depends on two main factors: lattice enthalpy and hydration enthalpy.
- **Lattice Enthalpy**: This is the energy required to separate one mole of a solid ionic compound into its gaseous ions. It generally increases with increasing charge and decreases with increasing ionic size.
- **Hydration Enthalpy**: This is the energy released when gaseous ions are surrounded by water molecules. It generally increases with decreasing ionic size.

4. **Analyze Each Sulfate**:
- **BeSO₄**: Beryllium sulfate is soluble in water due to its small size and high hydration enthalpy.
- **MgSO₄**: Magnesium sulfate is also soluble in water for similar reasons.
- **CaSO₄**: Calcium sulfate has limited solubility in water.
- **SrSO₄**: Strontium sulfate is poorly soluble in water.
- **BaSO₄**: Barium sulfate is insoluble in water.

5. **Conclusion**:
The sulfates that are readily soluble in water are BeSO₄ and MgSO₄. Therefore, the correct options are A (BeSO₄) and B (MgSO₄).

### Final Answer:
The alkaline earth metal sulfates which are readily soluble in water are: **A. BeSO₄ and B. MgSO₄**.

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