To show that rainwater does not contain dissolved impurities but well water contains them.
Question 8
Which of the following is a part of inorganic impurities of the sewage? (a) Pesticides (b) Urea (c) Phosphates (d) Vegetable waste
Which of the following is usually not a water pollutant?
(a) sewage
(b) fertiliser
(c) fly ash
(d) pesticide