Which one of the following statements is NOT TRUE?
(A) pH of drinking water should be between 5.5-9.5
(B) Concentration of DO below 6 ppm is good for the growth of fish
(C) Clean water would have a BOD value of less than 5 ppm
(D) Oxides of sulphur,nitrogen and carbon , are the most widespread air pollutant

BOD value less than 5 ppm indicates a water sample to be

BOD value less than 5 ppm indicates a water sample to be

BOD value less than 5 ppm indicates as water sample to be :

Study the following statements regarding acid rain and select the incorrect ones. (i) Acid rain refers to the rainfall and other forms of precipitation with a pH of less than 5. (ii) Oxides of sulphur and nitrogen are released from automobile exhausts, industries , power plants, etc. (iii) These oxides of sulphur and nitrogen, may react with water in the air and form sulphuric acid (H_(2)SO_(4)) and nitric acid (HNO_(3)) . (iv) Acid rain has harmful effects on animals and human beings but no characteristic impact on plants.

Biochemical oxygen demand (BOD) is a measure of organic meterial present in water : BOD value less than 5 ppm indicates a water sample to be

Biochemical Oxygen Demand (BOD) is a measure of organic materials present in water. If BOD value is less than 5ppm then water sample is to be

Biochemical Oxygen Deman, (BOD) is a measure of organic material present in water. BOD value less than 5 "ppm" indicates a water sample to be

Biochemical Oxygen Demand , (BOD) is a measure of organic material present in water . bOD value less than 5 ppm indicates a water sample to be ………. .

Assertion : The amount of BOD in the water is a measure of the amount of organic material in the water . Reason : Clear water has BOD less than 5 ppm whereas highly polluted water can have BOD value of 17 ppm or more .