| 41. | Properties in which isotopes differ are |
| a. | Chemical |
| b. | Physical |
| c. | electrical |
| d. | mechanical |
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Answer: (b).Physical
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| 42. | Value of molar volume is |
| a. | 22.14 dm3 |
| b. | 25.14 dm3 |
| c. | 32.14dm3 |
| d. | 44.14dm3 |
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Answer: (a).22.14 dm3
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| 43. | Atomic mass is mass of carbon taken as |
| a. | 12 |
| b. | 13 |
| c. | 14 |
| d. | 15 |
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Answer: (a).12
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| 44. | Species having a negative or positive charge are |
| a. | Radicals |
| b. | atoms |
| c. | molecules |
| d. | ions |
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Answer: (d).ions
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| 45. | Relative atomic mass of Cu is |
| a. | 61.5 |
| b. | 63.5 |
| c. | 64.5 |
| d. | 67.5 |
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Answer: (b).63.5
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