Q71
Which of the following conditions in drinking water causes methemoglobinemia?
Correct Answer
Option C
Solution
Concentration of nitrate > 50 ppm in drinking water causes methemoglobinemia
Environmental Chemistry
Q72
The concentration of dissolved Oxygen in water for growth of fish should be more than ppm and Biochemical Oxygen Demand in clean water should be less than ppm. X and Y in ppm are, respectively.
Correct Answer
Option D
Solution
For high growth, dissolved oxygen should be less than 6 ppm and clean water has dissolved oxygen less than 5 ppm.
Q73
Which is wrong with respect to our responsiblity as a human being to protect our environment?
Correct Answer
Option D
Solution
Plastic bag is harmful for our eviroment an plastic is non bio-degradable polutant.
Q74
The condition that indicates a polluted environment is :
Correct Answer
Option B
Solution
In Eutrophication nutrient enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity.
If indicates polluted environment.
Q75
The photochemical smog does not generally contain :
Correct Answer
Option C
Solution
Photochemical smog contain: Ozone, nitric oxide, organic compounds, nitrogen dioxide, formaldehyde.
is not the part of photochemical smog.
Q76
BOD stands for :
Correct Answer
Option C
Solution
BOD stands for Biochemical Oxygen Demand.
Q77
Correct statement about photo-chemical smog is :
Correct Answer
Option D
Solution
Photochemical smog occurs in warm, dry and sunny climate.
The main components of photochemical smog result from the action of unsaturated hydrocarbons and nitrogen oxides.
This is an oxidising smog.
Q78
Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?
Correct Answer
Option B
Solution
Out of the given options, the substance that is a better strategy to control environmental pollution in dry cleaning is carbon dioxide (CO2).
Option A: Tetrachloroethylene, also known as perchloroethylene (PERC), is a commonly used solvent in dry cleaning.
However, it is a hazardous air pollutant and a potential human carcinogen.
Its use has been restricted or banned in many countries due to its harmful effects on the environment and human health.
Option B: Carbon dioxide is a more environmentally friendly alternative to traditional dry cleaning solvents like PERC.
CO2 is a non-toxic, non-flammable, and readily available gas that can be used as a cleaning solvent when it is in its supercritical state.
CO2 dry cleaning is a "green" process that does not produce hazardous waste or emit harmful air pollutants.
Option C: Sulphur dioxide (SO2) is a common air pollutant that is emitted from the burning of fossil fuels.
It is not used as a dry cleaning solvent, and its use would not be an effective strategy to control pollution in dry cleaning.
Option D: Nitrogen dioxide (NO2) is also a common air pollutant that is emitted from the burning of fossil fuels.
It is not used as a dry cleaning solvent, and its use would not be an effective strategy to control pollution in dry cleaning.
Therefore, the correct option is Carbon dioxide.
Q79
The gas released during anaerobic degradation of vegetation may lead to :
Correct Answer
Option D
Solution
Methane (CH4) gas is evolved due to anaerobic degradation of vegetation which causes global warming and cancer.
It is a heat trapping gas that forces the planet to warm drastically and quickly.
Q80
Formation of photochemical smog involves the following reaction in which and are respectively. Choose the correct answer from the options given below :
Correct Answer
Option A
Solution
(i)
(ii)
(iii)
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