Fe3+(aq) + SCN-(aq) ⇆ Fe(SCN)2+(aq)
For the reaction represented above, the value of the equilibrium constant, Keq , is 240 at 25oC. From this information, correct deductions about the reaction at 25oC include which of the following?

I. The reaction is quite rapid
II. The product is favored over the reactants at equilibrium
III. The reaction is endothermic

(A) I only
(B) II only
(C) I and II only
(D) II and III only
(E) I, II, and III

(B) II only

Explanation:

In an equilibrium reaction, a keq > 1 means that the reaction is thermodynamically favored. That means the reaction will occurs doing the II affirmation TRUE. But the thermodynamic information doesn't make reference to the rate of the reaction doing I affirmation FALSE. Also, the Keq have relationship with ΔG parameter but ΔH parameter (exothermic or endothermic reaction) is independent of ΔG doing III affirmation FALSE. Thus, right answer is:

(B) II only

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