Given below are two statements:

Statement I : The value of the parameter “Biochemical Oxygen Demand (BOD)” is important for survival of aquatic life.

Statement II : The optimum value of BOD is 6.5 ppm.

In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following is not a common component of photochemical smog?

Sulphur dioxide is one of the components of polluted air. SO₂ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO₂ is

The BOD value of two samples of water are 4ppm and 18ppm, respectively and this indicates:
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Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm)
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Some tranquilizers are listed below. Which one from the following belongs to barbiturates?
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