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The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by Δ r G° = A – BT Where A and B are non-zero constants. Which of the following is TRUE about this reaction ?

1. Exothermic if B < 0
2. Endothermic if A > 0
3. Exothermic if A > 0 and B < 0
4. Endothermic if A < 0 and B > 0

Correct answer: Endothermic if A > 0

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