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Which of the following is not a colloidal solution?

1. Solid-Solid
2. Liquid-Liquid
3. Gas-Gas
4. Solid-Liquid

Correct answer: Gas-Gas

Solution

A colloidal solution requires a dispersed phase and a dispersion medium, so the two components must be in different states or at least form a dispersed system. Gas-gas mixtures are always true solutions because gases mix completely at the molecular level, so they do not form colloids.

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