50 mL of each gas A and of gas B takes 200 and 150 s respectively for effusing through a pinhole under the similar conditions. If the molecular mass of gas B is 36, the molecular mass of gas A will be:
1. 96
2. 128
3. 32
4. 64
The correct set of four quantum numbers for the valence electron of a rubidium atom (Z =37) is:
| 1. | \(5,1,1,+ {1 \over2}\) | 2. | \(6,0,0,+ {1 \over2}\) |
| 3. | \(5,0,0,+ {1 \over2}\) | 4. | \(5,1,0,+ {1 \over2}\) |
Acetone is treated with excess ethanol in the presence of hydrochloric acid. The product obtained will be:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
A metal crystallizes with a fcc lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is:
1. 288 pm
2. 408 pm
3. 144 pm
4. 204 pm
Which one of the following statements about enzyme catalysis is incorrect?
| 1. | Enzymes are mostly proteinous in nature. |
| 2. | Enzyme action is specific. |
| 3. | Enzymes are denaturized by ultraviolet rays at high temperatures. |
| 4. | Enzymes are least reactive at an optimum temperature. |
Which of the following represents the factor by which the rate of a zero-order reaction increases when the temperature is raised from 10°C to 100°C, if the rate doubles for every 10°C rise in temperature?
1. 256 times
2. 512 times
3. 64 times
4. 128 times
The disease caused by deficiency of vitamin B1 is:
| 1. | Convulsions | 2. | Beri-beri |
| 3. | Cheilosis | 4. | Sterility |
Among the following compounds the one that is most reactive towards electrophilic nitration is:
1. Benzoic acid
2. Nitrobenzene
3. Toluene
4. Benzene
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