| 31. | Most abundant molecular ions are |
| a. | Anions |
| b. | Cations |
| c. | Neutral ions |
| d. | Sulphur ions |
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Answer: (b).Cations
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| 32. | Elements with even number of isotopes are |
| a. | 156 |
| b. | 154 |
| c. | 153 |
| d. | 152 |
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Answer: (b).154
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| 33. | In accelerating chamber of mass spectrometer potential difference is |
| a. | 500-2000 |
| b. | 600-7000 |
| c. | 300-8000 |
| d. | 700-9000 |
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Answer: (a).500-2000
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| 34. | Isotopes have same |
| a. | atomic mass |
| b. | atomic number |
| c. | molecules |
| d. | atoms |
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Answer: (b).atomic number
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| 35. | Instrument use to measure exact 'atomic masses' is |
| a. | Mass spectrometer |
| b. | spectrometer |
| c. | nanometer |
| d. | both a and b |
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Answer: (a).Mass spectrometer
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