Which of the following is a common use of bleaching powder?
As a fertilizer
As a food preservative
As a disinfectant
As a flame retardant
Bleaching powder is commonly used as a disinfectant and a sanitizer due to its ability to kill bacteria, viruses, and fungi. Hence option C is the correct answer.
Option (A) is incorrect because bleaching powder is not used as a fertilizer. Hence option A is incorrect.
Option (B) is incorrect because bleaching powder is not used as a food preservative. Hence option B is incorrect.
Option (D) is incorrect because bleaching powder is not used as a flame retardant. Hence option D is incorrect.