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For the reaction step to be the controlling mechanism in a catalytic reversible reaction, which of the following is valid?

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For the reaction step to be the controlling mechanism in a catalytic reversible reaction, which of the following is valid?

(a) Rate of adsorption > Rate of desorption

(b) Rate of adsorption < Rate of desorption

(c) Rate of adsorption = Rate of desorption

(d) Rate of adsorption ≠ Rate of desorption
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Correct answer is (c) Rate of adsorption = Rate of desorption

To elaborate: If rate of adsorption of gas equals its rate of desorption, the mechanism is in equilibrium. Reaction becomes the controlling mechanism.
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