The correct answer is D. Bleaching powder.
Baking soda, washing soda, and baking powder are all common household items that have a variety of uses. However, none of them are effective at disinfecting drinking water. Bleaching powder, on the other hand, is a powerful disinfectant that can be used to kill harmful bacteria and viruses in water.
Baking soda is a white, crystalline powder that is used as a leavening agent in baking. It is also used as a cleaning agent and a deodorizer. Baking soda is not effective at disinfecting drinking water because it does not kill harmful bacteria and viruses.
Washing soda is a white, crystalline powder that is used as a laundry detergent and a cleaning agent. It is also used to make soap and glass. Washing soda is not effective at disinfecting drinking water because it does not kill harmful bacteria and viruses.
Baking powder is a white, powdery substance that is used as a leavening agent in baking. It is a combination of baking soda, cream of tartar, and cornstarch. Baking powder is not effective at disinfecting drinking water because it does not kill harmful bacteria and viruses.
Bleaching powder is a white, powdery substance that is used as a disinfectant and a bleaching agent. It is a mixture of calcium hypochlorite and hydrated lime. Bleaching powder is effective at disinfecting drinking water because it kills harmful bacteria and viruses.
To disinfect drinking water with bleach, add 1/8 teaspoon of bleach per gallon of water. Stir the water well and let it stand for 30 minutes. After 30 minutes, the water is safe to drink.