Dear ‚Äč Anirudh Tikode,

Homogeneous substances means the substance is in one phase. Homogeneous means the state of matter is one or identical.
Homogeneous substance or mixture are same the only difference between them is substance means one type of atom/molecule but mixture means two or more different atom/molecules. 
For example;
metals like sodium or copper in pure state are homogeneous, water in pure form is homogeneous. 
we can can call air as a homogeneous mixture because phase of air is gas and i.e homogeneous.
salt or sugar when dissolved completely in water is called homogeneous substance or mixture.
Sand in water is called heterogeneous substance or mixture.



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Dear student
A mixture which has uniform composition and properties throughout.
For example, air is a homogeneous mixture of gases.
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