Which of the following statements is NOT correct ?

1.	Which of the following statements is NOT correct ?
A.	Chlorides in potable water may be present from 300 ppm to 500 ppm.
B.	In order to be safe against pathogenic bacteria residual chlorine should remain between 0.05 ppm and 0.20 ppm.
C.	Presence of iron and maganese in excess of 0.3 ppm in dirinking water is objectionable.
D.	pH value for pure water is nearly 7.
Answer» B. In order to be safe against pathogenic bacteria residual chlorine should remain between 0.05 ppm and 0.20 ppm.

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Which of the following statements is NOT correct ?

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