Advertisements
Advertisements
प्रश्न
Can you guess why fire extinguishers throw a stream of carbon-di-oxide while putting - off the fire?
Advertisements
उत्तर
The reasons behind fire extinguishers throw a stream of CO while putting off fire:-
- CO2 is a colorless and in normal concentrations, odorless gas. It doesn’t react with burning materials, so it doesn’t create any toxic or other by-products while putting off the fire.
- Carbon dioxide doesn’t conduct electricity, making it an ideal fire suppressant for use in places where a large amount of electricity may be present.
- CO2 acts on fires in two ways: The release of the gas under pressure has a cooling effect, as can be seen by the resulting mist cloud and ice particles; the gas also displaces the oxygen that’s necessary to maintain combustion.
APPEARS IN
संबंधित प्रश्न
Classify Calcium oxide. Also give a balanced equation to prepare it.
Fill in the blank
Green plants need ________________to prepare food.
State what would happen, if the air above the earth contained mainly oxygen and no nitrogen
Match the statements in List 1 with the correct answers in List 2
| List 1 | List 2 | ||
| 1 | An impurity in air | A | Water vapour |
| 2 | The component of air which supports combustion | B | Respiration |
| 3 | The inert component in the air slightly soluble in water | C | Rare gases |
| 4 | The component of air which minimizes the rate of evaporation | D | Sulphur dioxide |
| 5 | The process which involves oxidation of food substance in living organisms | E | Helium |
| 6 | The component of air which finds application in observation balloons | F | Carbon dioxide |
| 7 | The process which involves oxidation of substances, liberating heat and light energy | G | Combustion |
| 8 | The component of air which is heavier than air and fairly soluble in water | H | Nitrogen |
| 9 | The process by which atmospheric carbon dioxide is absorbed by plants resulting in the formation of carbohydrates | I | Photosynthesis |
| 10 | The component of air which is lighter than air and less than 1% in air | J | Oxygen |
Give word equation for the following conversion:
Nitrogen of the air to nitric oxide
Compare respiration and combustion-both involving oxygen of the air.
Air is a mixture of many _______.
Air also contains a small amount of carbon-di-oxide, water vapour, and some other gases like argon,
Metals like magnesium, iron, and sodium burn in oxygen and give basic ______.
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
Mountaineers carry oxygen ______ with them, while climbing high mountains.
