Consider the following statements in respect of injecting chlorine between rapid sand filter and storage tank:1. More contact time is available.2. Chlorine demand is reduced.3. NHCl2 is formed which is more effective than residual chlorine.4. Break point chlorination takes place.Which of the above statements are correct?

Consider the following statements in respect of injecting chlorine bet

1.	Consider the following statements in respect of injecting chlorine between rapid sand filter and storage tank:1. More contact time is available.2. Chlorine demand is reduced.3. NHCl2 is formed which is more effective than residual chlorine.4. Break point chlorination takes place.Which of the above statements are correct?
A.	1, 2, 3 and 4
B.	1, 2 and 3 only
C.	1 and 2 only
D.	3 and 4 only
Answer» D. 3 and 4 only

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