Advertisements
Advertisements
प्रश्न
State and explain two ways by which air gets polluted in nature.
Advertisements
उत्तर
Air gets polluted in nature by following ways :
- During forest fire, a large amount of carbon particles (smoke) and carbon-monoxide pollute the air.
- When volcanoes erupt, a huge amount of ash and sulphur-dioxide is added in the air as pollutants.
APPEARS IN
संबंधित प्रश्न
Fill in the blanks :
Oxides of sulphur and nitrogen combine with rain water to form ___________ and _________ which cause ____________.
Fill in the blank by choosing the correct word from the given list.
List: oxygen, carbonic, suIphur dioxide gas, precipitation, helium
____________ gas can cause acid rain.
Tick (√ ) the most appropriate answer.
Galvanising is the process of coating iron with a layer of molten :
State two most important conditions for rusting.
Describe simple experiments to show the presence of -
oxygen and nitrogen component in air using a bell jar
In the laboratory preparation of oxygen from hydrogen peroxide answer the following:
State the method of collection of the oxygen gas giving reasons.
Give the main experimental points only to demonstrate that magnesium.
Give reason for the following:
Combustion and respiration show similarity.
What is meant by burning?
Match the following
| 1. | Burning of meteors | a. | Exosphere |
| 2. | Weather change | b. | Stratosphere |
| 3. | Lowest temperature | c. | Mesosphere |
| 4. | Ozone layer | d. | Troposphere |
