Question

The number of statement/s, which are correct with respect to the compression of carbon dioxide from point (a) in the Andrews isotherm from the following is ______ 

A. Carbon dioxide remains as a gas upto point (b) 
B. Liquid carbon dioxide appears at point (c) 
C. Liquid and gaseous carbon dioxide coexist between points (b) and (c) 
D. As the volume decreases from (b) to (c), the amount of liquid decreases

Hint:

In the Andrews isotherm, liquefaction begins at point (b) and ends at point (c), with \(CO_2\) existing as both liquid and gas between these points.

Answer 1

Correct Answer: 2

In the given Andrews isotherm:
• At point (a), \(CO_2\) exists as gas.
• At point (b), liquefaction of \(CO_2\) starts.
• Between points (b) and (c), \(CO_2\) exists as liquid and gas in equilibrium.
• At point (c), liquefaction ends, and beyond this, \(CO_2\) exists as a liquid.
Thus:
• Statement A is correct.
• Statement B is incorrect.
• Statement C is correct.
• Statement D is incorrect.
The correct statements are (A) and (C).