Which of the following is used to stop bleeding during shaving ?

Options

A. `Na_(2)CO_(3)`
B. NaCl
C. `K_(2)SO_(4)`
D. `K_(2)SO_(4)*Al_(2)(SO_(4))_(3)*24H_(2)O`

Answer

To determine which of the given options is used to stop bleeding during shaving, we can analyze each option based on its properties and common uses.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A) Na2CO3 (Sodium Carbonate)
- B) NaCl (Sodium Chloride)
- C) K2SO4 (Potassium Sulphate)
- D) Alum

2. **Analyze Each Option**:
- **Option A: Na2CO3 (Sodium Carbonate)**: This compound is primarily used in the manufacturing of glass, detergents, and as a pH regulator in swimming pools. It is not known for any medicinal or coagulating properties.
- **Option B: NaCl (Sodium Chloride)**: Commonly known as table salt, sodium chloride is used in food preservation and seasoning. It does not have properties that would help in stopping bleeding.
- **Option C: K2SO4 (Potassium Sulphate)**: This compound is mainly used as a fertilizer in agriculture. It does not have any application related to stopping bleeding.
- **Option D: Alum**: Alum is a chemical compound that has antiseptic properties and is known to act as a coagulating agent. It is commonly used to stop bleeding from minor cuts and scratches, such as those that may occur during shaving.

3. **Conclusion**: After analyzing all the options, it is clear that **Option D: Alum** is the correct answer as it is used to stop bleeding during shaving due to its coagulating properties.

### Final Answer:
**D) Alum**

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