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What makes an equilibrium heterogeneous?

AIts species occupy two or more phases
BIts species all carry an electric charge
CIts species are all solids or pure liquids
DIts constant is smaller than one in value
Answer & Solution
Correct answer: A. Its species occupy two or more phases
1. Heterogeneous means more than one phase is present in the system. 2. The phases may be any combination of solid, liquid, gas and solution. 3. Charge and the size of the constant play no part in the classification. 4. If every species were in one phase the equilibrium would be homogeneous instead. _Source: OpenStax Chemistry (CC BY 4.0), Ch 13 "Fundamental Equilibrium Concepts", section 13.2 Equilibrium Constants_
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