Consider the following reaction: 2FeCl3+6KI → 2Fe2+ + 6KCl+I2Rate = [FeCl3]1[KI]1. Choose the correct molecularity and order of a reaction.
Correct answer: A. 2 and 2
- A. 2 and 2
- B. 6 and 2
- C. 8 and 3
- D. 8 and 2
Explanation
Given: Rate law = Rate = k[FeCl₃]¹[KI]¹Overall order = 1 + 1 = 2Molecularity = number of species colliding in an elementary step. From the rate law, the elementary step likely involves 1 FeCl₃ + 1 KI, so molecularity = 2.
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Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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