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प्रश्न
Name the following:
The product formed when phosphorus burns in oxygen.
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उत्तर
Phosphorus pentoxide (P2O5).
संबंधित प्रश्न
Suggest five measures to prevent air pollution.
Tick (√) the most appropriate answer.
Symbiotic bacteria is not present in the nodules of :
Write fully balanced equation for the following :
Ca(OH)2 + CO2 →
Name the following:
A process which removes carbon dioxide from the air.
Compare the three main components of air i.e. nitrogen, oxygen and carbon dioxide with reference to their density and solubility, nature and reactivity.
Match the following
| 1. | Moving Air | Photosynthesis |
| 2. | Layer in which we live | Troposphere |
| 3. | Stratosphere | Wind |
| 4. | Oxygen | Ozone layer |
| 5. | carbon-di-oxide | Combustion |
Explain carbon dioxide and its uses.
Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.
- Bubbles of air came out from the bottle.
- Some water entered the bottle.
- Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.
- No bubbles formed, only water entered the bottle.
Which observations is/are correct?
Make sentences using the given set of words.
99%, oxygen, nitrogen, air, together
Observe the picture given in Fig. carefully and answer the following questions.
Why is he putting a cover on his nose?
