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How can a reaction with positive ΔG be made to occur?

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in Chemistry – Class 12 by (188k points)
How can a reaction with positive ΔG be made to occur?

(a) By increasing the temperature

(b) By decreasing the temperature

(c) By coupling it with another reaction

(d) It is not possible for the reaction to occur

I had been asked this question in final exam.

This question is from Thermodynamic Principles of Metallurgy topic in portion General Principles and Processes of Isolation of Elements of Chemistry – Class 12

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Best answer
Correct option is (c) By coupling it with another reaction

Best explanation: A reaction with ΔG positive can still be made to occur by coupling it with another reaction having large negative ΔG so that the net ΔG of the two reactions is negative (ΔG = change in the Gibbs energy of the reaction).

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