The most commonly used chemic method for purifying water is :

Options

A. Chlorination
B. Filtration
C. Boiling
D. Hydrogen peroxide

Answer

To solve the question regarding the most commonly used chemical method for purifying water, we can follow these steps:

### Step 1: Understand the Options
First, we need to identify the different methods mentioned for purifying water. The options include:
1. Chlorination
2. Filtration
3. Boiling
4. Hydrogen Peroxide

### Step 2: Analyze Each Method
Next, we analyze each method to determine if it is a chemical or physical method:
- **Chlorination**: This method involves adding chlorine to water, which is a chemical process that disinfects and purifies water by killing harmful bacteria and pathogens.
- **Filtration**: This is a physical method that involves passing water through a filter to remove impurities. It does not involve any chemicals.
- **Boiling**: This is also a physical method. Boiling water kills bacteria and pathogens through heat but does not involve any chemical agents.
- **Hydrogen Peroxide**: This is a chemical compound (H2O2) that can be used for disinfection, but it is not as commonly used as chlorination for water purification.

### Step 3: Identify the Most Commonly Used Method
Among the methods analyzed, chlorination stands out as the most commonly used chemical method for purifying water. It is widely practiced in municipal water treatment facilities and is recognized for its effectiveness in ensuring safe drinking water.

### Conclusion
The most commonly used chemical method for purifying water is **Chlorination**.

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