| 11. | Number of isotopes which oxygen atom has, are |
| a. | three |
| b. | five |
| c. | nine |
| d. | two |
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Answer: (a).three
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| 12. | C₃H₄O₃ is empirical formula for vitamin |
| a. | C |
| b. | A |
| c. | B |
| d. | D |
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Answer: (a).C
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| 13. | Moleis defined as mass of an element divided by |
| a. | Molar mass |
| b. | atomic number |
| c. | atomic mass |
| d. | empirical formula |
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Answer: (a).Molar mass
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| 14. | Ordinary microscope can measure up to |
| a. | 400nm |
| b. | 500nm |
| c. | 200nm |
| d. | 700nm |
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Answer: (b).500nm
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| 15. | Molecules expressed by formula unit mass are |
| a. | atoms |
| b. | neutral gases |
| c. | covalent |
| d. | ionic |
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Answer: (d).ionic
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