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Question

What property of gases allows them to fill any container completely?

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
Particles move freely and have negligible attraction.

Gas Properties: Filling Container Behavior

Gases possess the unique ability to fill any container completely due to specific characteristics of their constituent particles.

Key Property Explained

The primary reason gases fill their containers is the behavior of their particles:

  • Free Movement: Gas particles are in constant, random motion. They move rapidly in straight lines until they collide with other particles or the container walls.
  • Negligible Intermolecular Attraction: The forces of attraction between gas particles are very weak, almost non-existent. This allows them to spread far apart from each other.

Because the particles move freely and are not held close together by attractive forces, they will naturally expand to occupy the entire volume available to them, pushing outwards until they evenly distribute throughout the container.

Analysis of Options

  • Option 2 is correct: It accurately describes the free movement and negligible attraction of gas particles, which directly leads to them filling any container.
  • Option 1 is incorrect: Fixed particles describe solids.
  • Option 3 is incorrect: Definite volume and shape describe solids.
  • Option 4 is incorrect: Strong bonds with container walls are not a general property of gases that causes them to fill the entire volume.
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Similar Questions

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Important Questions from States of Matter

  1. Which of the following is not a characteristic of 'solid'?

  2. Which among the following is NOT an example of matter?

  3. Identify the element that is NOT a metalloid.

  4. What is called conversion from a liquid state to a gaseous state?

    A. Oxidization

    B. Sublimation

    C. Evaporation

    D. Condensation

  5. The gases obtained on heating FeSO4 are-

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