18. For a certain reaction at 25.0°C, the value of K is 1.2 × 10⁻³. At 50.0°C the value of K is 3.4 × 10⁻¹. This means that the reaction is
(A) exothermic
(B) endothermic
(C) never favorable
(D) more information needed
(E) none of these (A-D)

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