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Which one of the following statement is not true?
- Option 1)
pH of drinking water should be between 5.5-9.5.
- Option 2)
Concentration of DO below 6 ppm is good for the growth of fish
- Option 3)
Clean water would have a BOD value of less than 5ppm
- Option 4)
Oxides of sulfur, nitrogen and carbon are the most widespread air pollutant.
Answers (1)
As learnt in
Dissolved oxygen (DO) -
Amount of oxygen that water can hold in the solution
- wherein
DO in cold water = 10 ppm.
and
Biochemical oxygen demand (BOD) -
The amount of oxygen required for five days in one litre of water at 200 C for the microorganisms to metabolite organic waste.
- wherein
Clear water has BOD less than 5 ppm , highly polluted water has BOD of 17 ppm or more.
Growth of fish is inhibited if concentration of dissolved oxygen is below 6 ppm.
Option 1)
pH of drinking water should be between 5.5-9.5.
This option is incorrect
Option 2)
Concentration of DO below 6 ppm is good for the growth of fish
This option is correct
Option 3)
Clean water would have a BOD value of less than 5ppm
This option is incorrect
Option 4)
Oxides of sulfur, nitrogen and carbon are the most widespread air pollutant.
This option is incorrect
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