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प्रश्न
Write the chemical name of The white insoluble solid formed on the reaction of carbon dioxide with lime water.
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उत्तर
Calcium carbonate – CaCO3
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 |
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. | (a) Oxygen |
| 2. A gas used for filling weather observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Give two uses of the following component present in air:
oxygen
How is air useful to water boats?
What is meant by ozone depletion?
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
Give a brief account of the discovery of air and the scientists involved.
While freezing, the ______ of water is lowered.
State the meaning of the term atmosphere.
Wind does not help in the movement of which of the following?
