Chemistry
(a) What are the causes of air pollution?
(b) Suggest five measures to prevent air pollution.
Answer
(a) The causes of air pollution are:
- Natural process like volcanic eruptions, crop pollination etc.
- Burning of fuels and fibres.
- Deforestation
- Emission of harmful gases from vehicles.
- Use of chemicals like fertilizers, insecticides and pesticides in agricultural activities.
- Increase in number of industries.
- Use of chemical weapons in war.
(b) The five measures to prevent air pollution are:
- By growing more plants and trees.
- By installing tall chimneys with filters in factories and power plants.
- By using internal combustion engines in vehicles.
- By installing catalytic convertors in vehicles.
- Avoid burning of paper, garbage, dry leaves and other waste materials.
Related Questions
"Air is a mixture." Support this statement citing at least three evidences.
What is air pollution? What are the harmful effects of sulphur dioxide, nitrogen dioxide and hydrogen sulphide present in the air?
Name:
(a) The most abundant element in the earth's crust.
(b) A chemical called oxygenated water.
(c) A metal highly resistant to rusting.
(d) A mixture of oxygen and carbon dioxide used for artificial respiration.
(e) Two substances from which oxygen can be obtained on a large scale.
(f) An oxide and a carbonate containing oxygen.
(g) Two substances which undergo rapid oxidation.
(a) Taking hydrogen peroxide, how would you prepare oxygen in the laboratory?
(b) What is the role of manganese dioxide in the preparation of oxygen?
(c) Write the balanced chemical equation for the above chemical reaction.
(d) Why is hydrogen peroxide preferred in the preparation of oxygen gas?
(e) Why is oxygen collected by downward displacement of water?
(f) What happens when a glowing splinter is introduced in a jar containing oxygen?
(g) What happens when oxygen gas is passed through alkaline pyrogallol solution?