| 36. | John Dalton evidenced existence of atoms in |
| a. | 1808 |
| b. | 1898 |
| c. | 1838 |
| d. | 1856 |
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Answer: (a).1808
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| 37. | Instrument use to collect ions is |
| a. | Electrometer |
| b. | ionizer |
| c. | spectrometer |
| d. | nanometer |
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Answer: (a).Electrometer
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| 38. | Atomic mass of phosphorus is |
| a. | 11 |
| b. | 21 |
| c. | 31 |
| d. | 41 |
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Answer: (c).31
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| 39. | Gas molecules differ in their diameters from distance by |
| a. | 400 |
| b. | 300 |
| c. | 600 |
| d. | 500 |
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Answer: (b).300
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| 40. | Theoretical yield is decreased by |
| a. | distillation |
| b. | reaction |
| c. | weighing |
| d. | reactants |
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Answer: (a).distillation
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