Atmospheric Pollution
ICSE · Class 9 · Chemistry
Most important questions from Atmospheric Pollution for ICSE Class 9 Chemistry board exam 2026. MCQs, short answer, and long answer questions with marks.
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Which of the following are greenhouse gases?
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Carbon dioxide, Methane, Water vapour
Carbon dioxide, methane, and water vapour are all greenhouse gases that trap heat in the atmosphere. Nitrogen and oxygen are normal atmospheric gases that don't contribute to the greenhouse effect.
Which of the following contribute to air pollution?
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Automobile exhaust, Industrial emissions, Burning of fossil fuels, Forest fires
All sources except photosynthesis contribute to air pollution by releasing harmful gases and particles. Photosynthesis actually helps clean the air by absorbing CO₂.
The main function of the ozone layer is to:
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Protect from harmful ultraviolet rays
The ozone layer acts as a protective blanket that absorbs harmful ultraviolet rays from the sun, preventing them from reaching Earth's surface and protecting life from UV damage.
Sulphur dioxide in the atmosphere comes mainly from:
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Burning of fossil fuels containing sulphur
Sulphur dioxide is produced when fossil fuels like coal and oil, which contain sulphur compounds, are burned in power plants and industries.
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