Discussion :: UPSC Civil Service Exam Questions
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Which of the following statements is NOT correct ?
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A.
Chlorides in potable water may be present from 300 ppm to 500 ppm.
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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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C.
Presence of iron and maganese in excess of 0.3 ppm in dirinking water is objectionable.
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D.
pH value for pure water is nearly 7.
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