The percentage of chlorine in fresh bleaching powder is about A. 10 to 15 B. 20 to 25 C. 30 to 35 D. 40 to 50

10 to 15
20 to 25
30 to 35
40 to 50

The correct answer is A. 10 to 15.

Bleaching powder is a chemical compound with the formula CaOCl2. It is a white solid that is used as a bleaching agent, disinfectant, and pesticide. Bleaching powder is produced by the reaction of calcium hydroxide with chlorine gas. The percentage of chlorine in bleaching powder is typically between 10 and 15%.

Option B is incorrect because the percentage of chlorine in bleaching powder is typically less than 25%. Option C is incorrect because the percentage of chlorine in bleaching powder is typically less than 35%. Option D is incorrect because the percentage of chlorine in bleaching powder is typically less than 50%.