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Chapter-1 - 11th - Basic Concepts Preparation Multiple Questions and Answers.
| 16. | Which one of the following pair is not iso-electronic: | ||
| A. | CO, N2 | ||
| B. | Na+, Ne | ||
| C. | Ca, Ar | ||
| D. | K+, Ar | ||
| 17. | Which one of the following is not a molecular ion: | ||
| A. | N+2 | ||
| B. | CH+4 | ||
| C. | C6H+8 | ||
| D. | NH+ | ||
| 18. | 180 g of glucose contains number of hydrogen atoms: | ||
| A. | 3.6 x 1023 | ||
| B. | 6.0 x 1023 | ||
| C. | 7.2 x 1023 | ||
| D. | 7.2 x 1024 | ||
| 19. | Who first of all determined atomic masses of elements: | ||
| A. | J. Berzelius | ||
| B. | J.J. Thomson | ||
| C. | Johon Dalton | ||
| D. | Democritus | ||
| 20. | The mass of H-atom is 1.008 a.m.u. Its mass in kg should be: | ||
| A. | 1.008 x 1.661 x 10 -23 kg | ||
| B. | 1.008 1.661 x 10-27 kg | ||
| C. | 1.008 x 1.661 x 10-27 kg | ||
| D. | 1.661 x 10-27 kg | ||
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