Water sample which is likely to contain chlorine. will affect the results of bacteriological analysis of water. %Mich one of the following, if added in small amount in the test tube w ill help overcome it ?: (A) Potassium nitrate, (B) Copper sulphate, (C) Calcium hydrochloride, (D) Sodium thiosulphate
Answer is D. Ans. is 'd' i.e., Sodium thiosulphate