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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