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Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

1. Exothermic and increasing disorder
2. Exothermic and decreasing disorder
3. Endothermic and increasing disorder
4. Endothermic and decreasing disorder

Correct answer: Exothermic and increasing disorder

Solution

A reaction is spontaneous when Gibbs free energy (ΔG) is negative. This occurs when the reaction is exothermic (ΔH < 0) and the entropy increases (ΔS > 0), as both factors contribute to a negative ΔG.

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