Aluminium salt commonly used to stop bleeding is

Options

A. aluminium sulphate
B. potash alum
C. aluminium chloride
D. aluminium fluoride

Explanation

To determine the aluminium salt commonly used to stop bleeding, we can analyze the options provided:

1. **Aluminium Sulfate (Al2(SO4)3)**: This compound is often used in water purification and as a mordant in dyeing, but it is not primarily known for stopping bleeding.

2. **Potassium (K)**: This is not an aluminium salt and does not have any direct application in stopping bleeding.

3. **Aluminium Chloride (AlCl3)**: While this compound has various industrial applications, it is not commonly used for stopping bleeding.

4. **Potash Alum (KAl(SO4)2·12H2O)**: This is a double sulfate of potassium and aluminium. Potash Alum is known for its ability to coagulate blood, which helps in stopping bleeding. It is also referred to as "Pitkiri" in Hindi and is used in various applications, including water purification and as an astringent.

Based on the analysis, the aluminium salt commonly used to stop bleeding is **Potash Alum**.

### Step-by-Step Solution:
1. **Identify the Options**: List the aluminium salts provided in the question.
2. **Analyze Each Option**: Determine the uses of each salt in relation to stopping bleeding.
3. **Focus on Potash Alum**: Recognize that Potash Alum is specifically mentioned as a coagulating agent for blood.
4. **Conclude the Answer**: Confirm that the correct answer is Potash Alum.