Why it is said that air is a homogeneous mixture of various gases.

The?air?that you breathe is a?homogeneous mixture?of oxygen, nitrogen, argon, and carbon dioxide, along with other elements in smaller amounts. Because each layer of the Earth's?atmosphere?has a?different?density, each layer of?air?is its own?homogeneous mixture.
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Ans: 1) Air is a mixture of various gases such as oxygen, carbon dioxide, Nitrogen dioxide, Sulphur dioxide which is present is fixed proportion.
2) We can't easily distinguish the components of airs. Hence air is a homogeneous mixture.
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The?air?that you breathe is a?homogeneous mixture?of oxygen, nitrogen, argon, and carbon dioxide, along with other elements in smaller amounts. Because each layer of the Earth's?atmosphere?has a?different?density, each layer of?air?is its own?homogeneous mixture?
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