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#gas mixing

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What is the entropy change when two gases mix isothermally?

Mixing of gases increases disorder due to increased randomness, so Δ S > 0. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.