Which one of the following is the wrong assumption of kinetic theory of gases?
- Momentum and energy always remain conserved.
Pressure is the result of elastic collision of molecules with the container's wall.
Molecules are separated by great distances compared to their sizes.
All the molecules move in straight line between collision and with same velocity.
The Correct Option is D
Solution and Explanation
Molecules move very fast in all directions in a straight line by colliding with each other but with different velocity.
So, the correct option is (D): All the molecules move in straight line between collision and with same velocity.
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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.