Number of correct statement among the following is: (a) When the pH of rain water drops to 6.5, it is called acid rain. (b) The

Question

Number of correct statement among the following is:
(a) When the pH of rain water drops to 6.5, it is called acid rain.
(b) The acidity of soil can be reduced by adding powdered limestone.
(c) Peroxyacetal nitrate act as powerful eye irritant.
(d) Bacteria like escherichia coli causes gastrointestinal disease.
(e) Clean water should have BOD value of 17 ppm or more.
(f) The prescribed upper limit concentration of lead in drinking water is about 50 ppm

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