The rate determining step of a chemical reaction which occurs in more than one step depends upon the:
Correct answer: B. Slowest Step
- A. Fastest step
- B. Slowest Step
- C. Catalyst used
- D. Temperature of reaction
Explanation
Option B is correct since the rate of a chemical reaction depends on the slowest step in the reaction mechanism. This is a fact.Option A is incorrect since the fastest step has no bearing on the rate determination of a chemical reaction.Option C is incorrect since the catalyst used affects the activation energy needed to start a reaction. It lowers the need to use high temperatures and pressures. Again, it does not affect rate determination.Option D is incorrect since temperature does not have a bearing on rate-determining step.
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About Reaction Kinetics
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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