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प्रश्न
Fill in the blank:
Unpolluted water has _____ amount of dissolved oxygen.
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उत्तर
Unpolluted water has high amount of dissolved oxygen.
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संबंधित प्रश्न
Explain why:
Fused CaCl2 or conc. H2SO4 is used in a desiccator.
What is the composition of water? In what volume its elements combine?
Give a balanced equation for the following conversion:
Calcium sulphate in permanent hard water to calcium carbonate using sodium carbonate.
Fill in the blank:
The sample of hard water which lathers with soap after boiling and filtration contains _____.
Match the terms in List I with the correct answers in List II.
| List I | List II |
| 1. Solubility in a given solvent decreases with an increase in temperature. | A: Na2SO4.10H2O |
| 2. A white efflorescent crystal | B: NaOH |
| 3. A hygroscopic dehydrating agent | C: Ca(HCO3)2 |
| 4. A deliquescent alkali | D: conc. H2SO4 |
| 5. A substance present in temporary hard water | E: CaSO4 |
Unscramble the words and fill in the blanks.
- ondencsaonti ______
- vaeionorpat ______
- ecippitatrino ______
From where do the following usually get water? In which form is water present in them?
Animals
Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?
In a filtration, plant water is filtered using layers of
Fill in the blanks in the following statements using words given in the box.
| air, handpumps, cholera, water, large, ground |
A very ______ number of our people defecate in the open. It may cause ______ pollution and soil pollution. Both the surface water and ______ water get polluted. ______ water is the source for wells, tubewells and ______. Thus it becomes the most common route for ______ borne diseases like ______, dysentery, etc.
