Chemical compounds which are used for the purification of water :

Question

Accepted Answer

Option 4, "All the options are correct," is the correct answer because each of the listed chemical compounds plays a significant role in the purification of water. Here's a detailed explanation of why each option is correct and contributes to water purification:

1. **Alum or Phitkari**: Alum is commonly used in the process of coagulation during water treatment. It helps in the removal of suspended particles by causing them to clump together into larger particles, which can then be easily removed through sedimentation or filtration. This process is essential for improving the clarity and quality of water.

2. **Chlorine**: Chlorine is widely used as a disinfectant in water treatment. It effectively kills bacteria, viruses, and other pathogens, making the water safe for human consumption. Chlorination is a crucial step in ensuring that water is free from harmful microorganisms that can cause diseases.

3. **Bleaching Powder**: Bleaching powder, also known as calcium hypochlorite, is another disinfectant used in water purification. It releases chlorine when dissolved in water, which helps in disinfecting the water by eliminating pathogens. It is often used in emergency situations or in areas where other forms of chlorination are not feasible.

Since each of these compounds serves a unique and important function in the purification process, Option 4, "All the options are correct," accurately reflects the comprehensive approach needed for effective water treatment. Each compound contributes to different aspects of purification, ensuring that the water is both clear and safe for consumption.