Q1. Depletion of the ozone layer is mainly caused by:
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Answer: A. Chlorofluorocarbons (CFCs)
CFCs release chlorine in the stratosphere, which destroys ozone.
Chemistry - Environmental Chemistry Questions for SSC CGL (with Answers)
9 Chemistry - Environmental Chemistry MCQs from the General Awareness section, with answers and short explanations.
Score: 0 / 0
Q2. Which gas is the major contributor to global warming due to human activity?
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Answer: D. Carbon dioxide
CO2 from fossil fuels is the main human-made greenhouse gas.
Q3. Which gas leaked in the Bhopal gas tragedy of 1984?
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Answer: C. Methyl isocyanate
Methyl isocyanate leaked from a pesticide plant in Bhopal in December 1984.
Q4. Acid rain is mainly caused by which gases?
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Answer: C. Sulphur dioxide and oxides of nitrogen
SO2 and NOx dissolve in rainwater to form sulphuric and nitric acids.
Q5. The ozone layer that protects us from ultraviolet rays is located in the:
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Answer: B. Stratosphere
The ozone layer lies in the stratosphere.
Q6. Carbon monoxide is poisonous because it:
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Answer: B. Combines with haemoglobin and reduces oxygen transport
CO forms carboxyhaemoglobin, which cannot carry oxygen.
Q7. Rain water is termed 'acid rain' when its pH falls below about:
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Answer: A. 5.6
Rain is considered acid rain when its pH is less than 5.6.
Q8. Minamata disease is caused by poisoning due to:
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Answer: C. Mercury
Minamata disease was caused by methylmercury in fish.
Q9. Excessive growth of algae in water bodies due to run-off of fertilisers is called:
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Answer: D. Eutrophication
Excess nitrates and phosphates cause algal blooms - eutrophication.
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