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 ______ 
 Graph of compression of carbon dioxide
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

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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.

Updated On: Jan 8, 2025
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Correct Answer: 2

Solution and Explanation

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).

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Concepts Used:

States of Matter

The matter is made up of very tiny particles and these particles are so small that we cannot see them with naked eyes.

There are three States of Matter:

The three states of matter are as follows:

Solid State:

  • The solid-state is one of the fundamental states of matter.
  • Solids differ from liquids and gases by the characteristic of rigidity.
  • The molecules of solids are tightly packed because of strong intermolecular forces; they only oscillate about their mean positions.

Liquid State:

  • The molecules in a liquid are closely packed due to weak intermolecular forces.
  • These forces are weaker than solids but stronger than that of gases.
  • There is much space in between the molecules of liquids which makes their flowing ability easy.

Gaseous State:

  • In this state of matter, distances between the molecules are large (intermolecular distance is in the range of 10-7-10-5 cm.
  • The intermolecular forces experienced between them are negligible.
  • Thus, translatory, rotatory and vibratory motions are observed prominently in gases.