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प्रश्न
.................... is the purest form of natural water.
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उत्तर
Rain water is the purest form of natural water.
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संबंधित प्रश्न
What is the major source of fresh water in the city/town/village where you live?
Give balanced chemical equation for the reaction of water with Sodium oxide.
Give one word for the following statement:
The gaseous form of water found in air .
Answer the following question:
What is the chemical composition of water ? Give its molecular formula.
How are clouds formed?
Water exists in all three states. Discuss.
Give the influence of pressure.
If, at some place, it did not rain for a very long period of time, what would be its effect on the life of the people there?
Match the following
| 1. | Flood | Lake |
| 2. | Surface water | Evaporation |
| 3. | Sunlight | Water vapour |
| 4. | Cloud | Pole |
| 5. | Frozen water | Increased rainfall |
Match the items of Column I with the items of Column II with reference to sewage.
| Column I | Column II | ||
| (a) | Inorganic impurities | (i) | phosphorus and nitrogen |
| (b) | Organic impurities | (ii) | nitrates and phosphates |
| (c) | Nutrients | (iii) | cholera and typhoid |
| (d) | Bacteria | (iv) | pesticides and herbicides |
