Question

What is the permissible concentration of residual  chlorine present in drinking water in mg/L?

A 0.05 – 1 mg/L
B 0.5 – 0.25 mg/L
C 0.02 – 0.05 mg/L
D 0.2 – 2.0 mg/L
Practice Next

Relevant for Exams:

Hey! Ask a query