Class/Course - Class XI

Subject - Chemistry

Chapter - Environmental Chemistry


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Q.1 Which one of the following statement is not true?
  Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant
  pH of drinking water should be between 5.5-9.5
  Concentration of DO below 6 ppm is good for the growth of fish
  Clean water would have a BOD value of less than 5 ppm