Question

Air is an example of a solution of

• A. gas in solid
• B. liquid in gas
• C. gas in liquid
• D. gas in gas

Hint:

Do not let the word "solution" trick you into thinking only of liquids! Any stable, single-phase homogeneous mixture counts as a solution. Since the components of clean air are completely miscible gases that never settle out, it functions as a gaseous solution.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The problem asks us to categorize atmospheric air into its proper solution classification type based on the physical states of the solute and solvent components.

Step 2: Key Formula or Approach:
A solution is defined as any homogeneous mixture of two or more substances. Solutions can exist in solid, liquid, or gaseous phases depending on the physical states of the constituent substances.

Step 3: Detailed Explanation:
Atmospheric air is a homogeneous mixture composed primarily of nitrogen ($\approx 78\%$, acting as the gaseous solvent) and oxygen ($\approx 21\%$, acting as a gaseous solute), along with trace amounts of argon, carbon dioxide, and other water vapors. Since both the major components dispersing and the minor components being dispersed exist completely in the gaseous phase, air is classified as a homogeneous

gas-in-gas solution.

Step 4: Final Answer:
Air is a solution of gas in gas, which matches option (D).