Alum is used for

Options

A. cleaning turbid water
B. making water muddy
C. making water tasty
D. None of the above

Answer

### Step-by-Step Solution:

1. **Understanding Alum**: Alum is a chemical compound known as Aluminium Sulphate. It is commonly referred to as alum in various contexts.

2. **Primary Use of Alum**: The main application of alum is in water treatment processes. It is particularly effective in purifying water by removing impurities.

3. **Mechanism of Action**: Alum works by causing the particles in the water to clump together (a process known as coagulation). This helps in removing unwanted colors and turbidity from the water.

4. **Identifying the Correct Option**: Given the options:
- A) Cleaning turbid water
- B) Making water muddy
- C) Making water tastier
- D) None of this

The correct answer is option A, as alum is primarily used for cleaning turbid water.

5. **Conclusion**: Therefore, alum is used for cleaning turbid water, making it clearer and safer for consumption.