Question:
The INCORRECT assumption in the kinetic theory of gases is
The INCORRECT assumption in the kinetic theory of gases is
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"Elastic collision" by definition means kinetic energy is conserved. If you know collisions are elastic (Postulate B), then you immediately know Postulate D must be false.
Updated On: Apr 29, 2026
- Interactions between molecules is negligible
- Collisions between molecules are elastic in nature
- Molecules move in straight lines between any two collisions
- During collisions total kinetic energy is not conserved
- Gas molecules are in incessant random motion
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
The Kinetic Theory of Gases (KTG) is a theoretical model that describes the behavior of an ideal gas based on several postulates.
Step 3: Detailed Explanation:
- Postulate A: Ideal gas molecules have no forces of attraction or repulsion (Interactions are negligible). This is a Correct assumption of KTG.
- Postulate B: Collisions are perfectly elastic. This is a Correct assumption.
- Postulate C: Molecules move in straight lines at constant speed between collisions. This is a Correct assumption.
- Postulate E: Gas molecules move randomly and continuously in all directions. This is a Correct assumption.
- Postulate D: Because collisions are perfectly elastic, the total kinetic energy must be conserved. Therefore, stating that KE is "not conserved" is Incorrect.
Step 4: Final Answer:
Statement D is the incorrect assumption.
The Kinetic Theory of Gases (KTG) is a theoretical model that describes the behavior of an ideal gas based on several postulates.
Step 3: Detailed Explanation:
- Postulate A: Ideal gas molecules have no forces of attraction or repulsion (Interactions are negligible). This is a Correct assumption of KTG.
- Postulate B: Collisions are perfectly elastic. This is a Correct assumption.
- Postulate C: Molecules move in straight lines at constant speed between collisions. This is a Correct assumption.
- Postulate E: Gas molecules move randomly and continuously in all directions. This is a Correct assumption.
- Postulate D: Because collisions are perfectly elastic, the total kinetic energy must be conserved. Therefore, stating that KE is "not conserved" is Incorrect.
Step 4: Final Answer:
Statement D is the incorrect assumption.
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