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Environmental Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEnvironmental Chemistry1 Mark
MCQ
Which one of the following statements is not true?
  • A
    Oxides of sulphur, nitrogen and carbon are the most wide spread air pollutant.
  • B
    $\ce{pH}$ of drinking water should be between $5.5-9.5.$
  • ✓
    Concentration of $\ce{DO}$ below $5\text{ ppm}$ is good for the growth of fish.
  • D
    Clean water would have a $\text{BOD}$ value less than $5\text{ ppm}.$
✓

Answer

Correct option: C.
Concentration of $\ce{DO}$ below $5\text{ ppm}$ is good for the growth of fish.

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