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

Options

A. It is sued 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.

Answer

To determine which statement is true about calcium hydroxide, \( Ca(OH)_2 \), let's analyze each option step by step.

### Step 1: Analyze the statements

1. **Statement A**: "It is used in the preparation of bleaching powder."
2. **Statement B**: "It is a light blue colored solid."
3. **Statement C**: "It does not possess disinfecting properties."
4. **Statement D**: "It is used in the manufacturing of cement."

### Step 2: Evaluate each statement

**Statement A**: Calcium hydroxide is indeed used in the preparation of bleaching powder. When it reacts with chlorine gas, it forms calcium hypochlorite, which is the active ingredient in bleaching powder. Thus, this statement is **true**.

**Statement B**: Calcium hydroxide is not a light blue colored solid; it is typically a white solid. Therefore, this statement is **false**.

**Statement C**: Calcium hydroxide does have some disinfecting properties, especially in higher concentrations, as it can kill bacteria. Thus, this statement is **false**.

**Statement D**: Calcium hydroxide is not directly used in the manufacturing of cement. Instead, compounds like calcium sulfate (gypsum) and calcium silicates are used. Therefore, this statement is **false**.

### Conclusion

After evaluating all the statements, the only true statement about \( Ca(OH)_2 \) is **Statement A**: "It is used in the preparation of bleaching powder."

### Final Answer

The true statement about \( Ca(OH)_2 \) is: **It is used in the preparation of bleaching powder.**

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