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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 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 |
Fill in the blank:
_____________ discovered the oxygen gas.
Give two uses of the following component present in air:
oxygen
Fill in the blank
Polluted air is harmful to ____.
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Air is a mixture and not a compound since the components of air cannot be separated by physical methods.
What will happen if the number of vehicles and factories in your surroundings increases?
With whom should I pair up?
| Group A | Group B | ||
| (1) | Air | (a) | Excretion |
| (2) | Water | (b) | Scattering of light |
| (3) | Soil | (c) | Plasticity |
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. The constituent of air which is around 0.02% | A: Nitrogen |
| 2. The constituent of air which is inert or unreactive | B: Oxygen |
| 3. The constituent of air which is non-combustible, but supports combustion. |
C: Sulphur dioxide |
| 4. A pollutant in air responsible for acid rain | D: Carbon dioxide |
| 5. The main rare gas present in air. | E: Argon |
Fill in the blank:
Nitrogen of the air is utilized by plants for formation of _____.
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
The ______ makes the windmill rotate.
