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प्रश्न
Write the chemical name of Lime water
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उत्तर
Calcium hydroxide Ca(OH)2
These droplets were present in the air as moisture which got condensed on the cooler walls of a glass tumbler. This shows the presence of water vapours in air.
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संबंधित प्रश्न
Match the following :
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
Discuss harmful effects of greenhouse effect.
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Name three greenhouse gases.
Fill in the blank
Although we cannot see air, we can ___it.
Tick (√) the correct alternative from the choice given for the following statement.
Photosynthesis is a process in which plants
Answer in your own words.
What are the various constituents of air? Write their uses.
Draw a neat labelled diagram for the following experiment.
To prove that oxygen is non-combustible, but supports combustion.
Explain the following observations very briefly
A firki does not rotate in a closed area.
