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Q.Why does a gas mixed with another gas not form a colloidal system?

gas and gas form a homogenous mixture and definition of colloid is heterogenous system and hence this happens.

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Why is there no gas-gas colloid?

Answer:the dispersed phase (call it gas #1) is already at the molecular level and disperses evenly throughout the dispersing medium (call it gas #2). It is completely homogeneous at the molecular level. It is a solution.

An example of this is the atmosphere. Using only the two major gases, we can consider the atmosphere to be oxygen dissolved into nitrogen.

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bcuz they are gas and the particles do not settle so it would be hard for gas to be a colloid.

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