Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction

A. I and II only  
B. I, II and III only
C. II and III only
D. II, II and IV only
E. III and IV only

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Correct Answer: A