| 21. | The ratio of the rate of diffusion of oxygen and hydrogen is |
A. 1:4′ | |
B. 1:1′ | |
C. 1:2′ | |
D. 2:1′ |
| 22. | Equal volumes of different gases under the same conditions of temperature and pressure have the same number of |
A. of nuclear | |
B. of molecule | |
C. of origin | |
D. of electrons |
| 23. | In the gaseous equation pV = nRT, r stands for |
A. any atom of a gas | |
B. one gram of gas | |
C. one mole of gas | |
D. one liter of gas |
| 24. | Which of the following law is not related to gas? |
A. Boyle’s law | |
B. charles law | |
C. Gay-Lussac’s law | |
D. faraday’s law |
| 25. | pressing a gas |
A. pressure only increases | |
B. volume increases | |
C. pressure and temperature both increase | |
D. pressure increases and temperature decreases |
| 26. | The energy of an ideal gas depends on |
A. on pressure | |
B. on volume | |
C. at temperature | |
D. on the number of moles |
| 27. | All gases attain zero entropy when the temperature is – |
A. -273ºC | |
B. 27.3ºC | |
C. 273ºC | |
D. 180ºC |
| 28. | What is the value of ultimate temperature? |
A. 0ºC | |
B. -273ºC | |
C. 100ºC | |
D. 180ºK |
| 29. | absolute zero temperature |
A. starting point of any temperature scale | |
B. theoretically lowest possible temperature | |
C. the temperature at which the vapors of all liquids freeze | |
D. The temperature at which all liquids are in the vapor phase |
| 30. | The pressure of a given mass of a gas at a given temperature is inversely proportional to its volume. |
A. charles law | |
B. boyle’s law | |
C. Dalton’s law | |
D. graham’s law |