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प्रश्न
Fill in the blank:
The type of water softened by addition of washing soda is ______.
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उत्तर
The type of water softened by addition of washing soda is both types.
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संबंधित प्रश्न
Name the four main sources of water.
Name the two gases from which water is formed. What is the chemical composition of these two gases in water ?
.................... is the purest form of natural water.
Explain how the peculiar variation of density of water with temperature can protect marine-life.
Water exists in all three states. Discuss.
What will happen if the total supply of potable water is finished?
Fill in the blank:
The sample of hard water which lathers with soap after boiling and filtration contains _____.
True or false? Correct the wrong statement.
We get rainwater throughout the year.
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 |
