Condensation of gases
Condensation of gases
Condensation of gases: The conversion of gas into liquid is called condensation. It can be carried out by either increasing the pressure on the gas or decreasing its temperature. By doing this, the intermolecular distance is decreased and force of attraction is increased thus changing into liquid state.
· Dry Ice: carbon dioxide gas at very low temperature and under high pressure can be transformed into a solid which appears like ice. The solid so obtained is called dry ice. On reducing the pressure on the surface of the solid, it gets directly converted into vapour without changing its liquid state. So, dry ice is a sublimable substance.
· Condensation of water vapour: it takes place on a cold surface. By taking ice in a glass container. Ice absorbs heat from the air and starts to melt. The moisture present in air is thus cooled and finally gets condensed on the outer walls of the container as water droplets.
Which of the following are correct : (a) On reducing the pressure on the surface of the solid(dry ice), it gets directly converted into vapour without changing its liquid state. (b) On reducing the pressure on the surface of the solid(dry ice), it gets directly converted into liquid. (c)On reducing the pressure on the surface of the solid(dry ice), it remains same, there will be no change in appearance of dry ice. | |||
| Right Option : A | |||
| View Explanation | |||
Condensation takes place by ______________________________. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) The conversion of gas into liquid is called condensation. (b) Condensation can be carried out by either increasing the pressure on the gas or decreasing its temperature. (c) By decreasing its temperature, the intermolecular distance is decreased and force of attraction is increased thus changing into liquid state. | |||
| Right Option : D | |||
| View Explanation | |||
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