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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