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Question
Assertion :Liquefication of a gas is a continuous process with increase in pressure below Tc. Reason: Liquefication of a gas is a discontinuous process with increase in pressure below Tc.
Assertion :Liquefication of a gas is a continuous process with increase in pressure below Tc. Reason: Liquefication of a gas is a discontinuous process with increase in pressure below Tc.
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Solution
The correct option is D Assertion is incorrect but Reason is correct
Thomas Andrews experiment is basically the study of liquefaction of gases.study the critical phenomenon. His scientific experiments involved the study of the effect of pressure on the volume of a fixed mass of carbon dioxide gas at different constant temperatures.
At the lowest temperature used that is 13.1 C, at low pressure, CO2 exits as a gas. As the pressure is increased, the volume of the gas decreases along the curve AB. At point B, liquefaction of the gas starts. Hence the volume decreases rapidly along BC because liquid has much less volume than the gas. At point C, liquefaction is complete. Now the increase in pressure has very little effect upon volume because liquids are very less compressible. Hence the curve CD is very steep. As the temperature is increased further and the moment it reaches 30.98 0C, the horizontal portion becomes very small, indicating that above 30.98 liquefied at all however high pressure is applied. So, 30.98 0C is the critical temperature. The corresponding pressure to liquefy the gas is critical temperature and the volume occupied by one mole of gas under these conditions is critical volume.
Thomas Andrews experiment is basically the study of liquefaction of gases.study the critical phenomenon. His scientific experiments involved the study of the effect of pressure on the volume of a fixed mass of carbon dioxide gas at different constant temperatures.
At the lowest temperature used that is 13.1 C, at low pressure, CO2 exits as a gas. As the pressure is increased, the volume of the gas decreases along the curve AB. At point B, liquefaction of the gas starts. Hence the volume decreases rapidly along BC because liquid has much less volume than the gas. At point C, liquefaction is complete. Now the increase in pressure has very little effect upon volume because liquids are very less compressible. Hence the curve CD is very steep. As the temperature is increased further and the moment it reaches 30.98 0C, the horizontal portion becomes very small, indicating that above 30.98 liquefied at all however high pressure is applied. So, 30.98 0C is the critical temperature. The corresponding pressure to liquefy the gas is critical temperature and the volume occupied by one mole of gas under these conditions is critical volume.
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