Gases | MCQs

Explanation

• Air is a mixture of different gases.
• Primarily consisting of nitrogen (78%), oxygen (21%), and trace amounts of other gases.

Explanation

Gas: No definite shape or volume – Expands to fill any container.

Example: Oxygen, CO₂.

Solid: Fixed shape and volume (e.g., iron).

Liquid: Fixed volume, no fixed shape (e.g., water).

Explanation

• Have indefinite shape
• Have indefinite volume
• Can be compressed

Explanation

• Liquids have a lower mobility than gases.
• In a liquid, the molecules are close together and have a certain degree of attraction, which limits their ability to move freely.
• In contrast, gas molecules are widely spaced.
• It have little attraction, allowing them to move more freely and rapidly.