Question:
If a gas is expanded at constant temperature
If a gas is expanded at constant temperature
Updated On: June 02, 2025
- the pressure decreases
- the kinetic energy of the molecules remains the same
- the kinetic energy of the molecules decreases
- the number of molecules of the gas increases
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The Correct Option is B
Solution and Explanation
Pressure is inversely proportional to volume at constant temperature, hence (a) is correct.
Average kinetic energy of a gas is directly proportional to absolute temperature, hence (b) is correct.
Expansion at constant temperature cannot change the number of molecules, hence (d) is incorrect.
Average kinetic energy of a gas is directly proportional to absolute temperature, hence (b) is correct.
Expansion at constant temperature cannot change the number of molecules, hence (d) is incorrect.
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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.