Chemistry
The gas responsible for ozone depletion is:
- oxygen
- chlorofluorocarbons
- carbon dioxide
- sulphur dioxide
Air
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Answer
chlorofluorocarbons
Reason — Air pollutants like chlorofluorocarbons (CFCs) reacts with the ozone in the atmosphere and reduce the density of ozone in the stratosphere.
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Related Questions
Which of the following is not a greenhouse gas?
- Carbon dioxide
- Sulphur dioxide
- Methane
- Nitrous oxide
Common air pollutants that cause respiratory diseases are:
- ozone
- inert gases
- dust and smoke
- water vapour
Fill in the blanks:
(a) The layer of air around the earth is called the …………… .
(b) Although we cannot see air, we can …………… it.
(c) Air is a …………… of gases.
(d) Plants and animals maintain the balance of …………… and …………… in air.
(e) Polluted air is …………… for health.
(f) The supporter of combustion in air is …………… .
(g) Green plants need …………… to prepare food.
(h) Oxygen is used in …………… of the food to get …………… .
(i) Aquatic plants and animals use …………… in water.
(j) The reddish brown powder on the surface of iron nails exposed to air and moisture is called …………… .
Write 'true' or 'false' for the following:
(a) Air is a compound. ……………
(b) Carbon dioxide is given out during photosynthesis. ……………
(c) Respiration needs nitrogen. ……………
(d) The composition of air was discovered by Lavoisier. ……………
(e) The major component of air is oxygen. ……………