Which of the following best describes the mixture of air? 

The correct answer is Homogeneous mixture.

Key Points

• A homogeneous mixture is a mixture that has the same composition throughout.
• In a homogeneous mixture, the different components are uniformly distributed at the molecular level.
• Air is a mixture of different gases such as nitrogen (78%), oxygen (21%), and small amounts of other gases like argon and carbon dioxide.
• These gases are thoroughly mixed, resulting in a uniform composition throughout the sample.
• Because the composition is uniform, air is considered a homogeneous mixture.

 Additional Information

• Suspension
  • A suspension is a heterogeneous mixture in which solid particles are dispersed in a liquid or gas but are not dissolved.
  • In a suspension, the particles are large enough to eventually settle out due to gravity.
  • An example of a suspension is muddy water, where soil particles are dispersed in water.
• Heterogeneous mixture
  • A heterogeneous mixture is a mixture where the components are not uniformly distributed, and different parts of the mixture have different compositions.
  • An example of a heterogeneous mixture is a salad, where different ingredients like lettuce, tomatoes, and cucumbers can be seen and separated physically.
• Colloids
  • A colloid is a mixture where very small particles of one substance are evenly distributed throughout another substance.
  • The particles in a colloid are larger than those in a solution but smaller than those in a suspension.
  • An example of a colloid is milk, which contains fat droplets dispersed in water.