Which of the following statements is true about `Ca(OH)_(2)`?

Options

A. It is used in the preparation of bleaching powder
B. It is a light blue solid
C. It does not possess disinfectant property
D. It is used in the manufacture of cement

Explanation

To determine which statement is true about calcium hydroxide, \( \text{Ca(OH)}_2 \), we will analyze each option provided.

### Step-by-Step Solution:

1. **Evaluate Option 1: "It is used in preparation of bleaching powder."**
- Calcium hydroxide is indeed used in the preparation of bleaching powder. The reaction involves calcium hydroxide reacting with chlorine gas to produce bleaching powder.
- **Conclusion**: This statement is **true**.

2. **Evaluate Option 2: "It is a light blue solid."**
- Calcium hydroxide is not a light blue solid; it is typically a **milky white** solid.
- **Conclusion**: This statement is **false**.

3. **Evaluate Option 3: "It does not possess a disinfecting property."**
- Calcium hydroxide does possess disinfecting properties and is used as a disinfectant in various applications.
- **Conclusion**: This statement is **false**.

4. **Evaluate Option 4: "It is used in manufacturing of cement."**
- The compound primarily used in the manufacturing of cement is calcium oxide (\( \text{CaO} \)), not calcium hydroxide.
- **Conclusion**: This statement is **false**.

### Final Conclusion:
From the analysis above, the only true statement about \( \text{Ca(OH)}_2 \) is that it is used in the preparation of bleaching powder.