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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