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Every Day Science Section-4 Multiple Questions and Answers.
| 26. | Water is universal solvent for what reactions: | ||
| A. | Physical | ||
| B. | Chemical | ||
| C. | Biochemical | ||
| D. | Proteins | ||
| 27. | The volume percentage of nitrogen in air is: | ||
| A. | 60% | ||
| B. | 67% | ||
| C. | 78% | ||
| D. | 88% | ||
| 28. | Air contains volume of carbon dioxide approximately: | ||
| A. | 3% | ||
| B. | 33% | ||
| C. | 44% | ||
| D. | 0.03% | ||
| 29. | Which of the following is involved in blood clotting, | ||
| A. | Sodium | ||
| B. | Magnesium | ||
| C. | Calcium | ||
| D. | Oxygen | ||
| 30. | For water purification, we use: | ||
| A. | Chlorine | ||
| B. | Bromine | ||
| C. | Fluorine | ||
| D. | Calcium | ||
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