Which substance can be used for disinfecting water?

Explanation

As mentioned earlier, potassium permanganate is a powerful oxidizing agent and can effectively disinfect water by killing bacteria and other harmful microorganisms. It is commonly used in emergency water treatment situations and is known for its disinfectant properties. Therefore, option (a) is correct.Now we'll look at why other options are incorrect.(b) Alums:Alum, such as aluminum sulfate or potassium aluminum sulfate, is primarily used as a coagulant in water treatment processes rather than for disinfection purposes. While it can help clarify water by removing suspended particles, its main function is not as a disinfectant. Therefore, option (b) is incorrect.(c) Ozone:Ozone is indeed a potent disinfectant that can effectively kill bacteria, viruses, and other microorganisms in water. It is commonly used in water treatment plants and for purifying drinking water. Therefore, option (c) is also correct.(d) All:Option (d) states that all the substances listed can be used for disinfecting water. While this is true for KMnO4 and ozone, as explained above, alums are not primarily used as disinfectants. Therefore, option (d) is incorrect.(Environmental chemistry,Solid Waste Management and Water Treatment)