When the reaction completes in more than one steps rate of reaction will be determined by________________?
Correct answer: B. Slowest step
- A. Fast step
- B. Slowest step
- C. All steps
- D. Molecularity of the reaction
Explanation
In a multistep mechanism, the slowest elementary step has the greatest resistance and limits how quickly the overall reaction can proceed. Consequently, it is called the rate-determining step. Students may choose c because every step is involved, but the slowest step controls the overall rate.
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About Rate of Reaction
Reaction rate measures the change in concentration of a reactant or product per unit time. Questions connect rate with concentration, temperature, pressure, surface area, catalysts and nature of reactants, and may involve rate laws, reaction order, activation energy and collision theory. Rate describes speed, whereas equilibrium describes the final balance of opposing reactions.
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