Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest `pH` value?

Options

A. `LiCl`
B. `BeCl_(2)`
C. `BaCl_(2)`
D. `AlCl_(3)`

Explanation

To solve the question of which equimolar solution among the given substances will record the highest pH value, we need to analyze the nature of each substance in terms of acidity and basicity.

### Step-by-Step Solution:

1. **Identify the Substances**: The substances given are:
- LiCl (Lithium Chloride)
- BeCl2 (Beryllium Chloride)
- BaCl2 (Barium Chloride)
- AlCl3 (Aluminum Chloride)

2. **Understand the Nature of Each Substance**:
- All the substances are salts formed from strong acids (HCl) and different bases.
- The pH of a salt solution depends on the strength of the acid and the base from which it is formed.

3. **Determine the Bases**:
- LiCl is formed from LiOH (Lithium Hydroxide), a strong base.
- BeCl2 is formed from Be(OH)2 (Beryllium Hydroxide), a weak base.
- BaCl2 is formed from Ba(OH)2 (Barium Hydroxide), a strong base.
- AlCl3 is formed from Al(OH)3 (Aluminum Hydroxide), a weak base.

4. **Assess the Basicity**:
- Strong bases will lead to a higher pH than weak bases.
- LiOH and Ba(OH)2 are strong bases, while Be(OH)2 and Al(OH)3 are weak bases.

5. **Compare the pH Values**:
- Since LiCl and BaCl2 are formed from strong bases, they will have a neutral pH (around 7) when dissolved in water.
- However, since Ba(OH)2 is a stronger base than LiOH, BaCl2 will lead to a higher pH than LiCl.
- BeCl2 and AlCl3, being formed from weak bases, will have a pH less than 7.

6. **Conclusion**:
- Among the given salts, BaCl2 will record the highest pH value due to the strong basic nature of Ba(OH)2.

### Final Answer:
**BaCl2 will record the highest pH value among the given substances.**