Question

In the treatment of 20,000 m'/day of water, the amount of chlorine used is 12 kg/day. The
residual chlorine after 10 minutes contact is 0.25 mg/l. The chlorine demand in kg per day
is
(A) 10
(B) 5
(C) 12
D7​

Answer 1

Answer:

(c)12..............................