Question

What amount of bleaching powder is necessary to disinfect choleric stools?

• A. 50 gm/lit
• B. 75 gm/lit
• C. 90 gm/lit
• D. 100 gm/lit

Hint:

Recall the standard bleaching powder dose for disinfecting infective excreta.

Answer 1

The Correct Option is A

Step 1: Excreta from cholera cases must be disinfected before disposal to break transmission. The recommended amount of bleaching powder for choleric stools is about 50 gm per litre, so option a is correct.

Step 2: Bleaching powder (calcium hypochlorite) releases chlorine, which oxidises and kills Vibrio cholerae. Adding roughly 50 gm per litre of stool provides enough available chlorine for effective disinfection.

Step 3: After mixing, the excreta are allowed to stand for adequate contact time before disposal, ensuring the organisms are inactivated.

Step 4: Higher figures such as 75, 90 or 100 gm per litre exceed the standard recommendation, so options b, c and d are not the expected answer.