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MHT CET Chemistry Chemical Kinetics 2026 MHT CET 2026 (11 April Shift 1)

MHT CET Chemistry Question (2026) — Solution

Question

Which of the following statements is NOT true about the rate constant?

Options

  1. A. It is proportionality constant in rate law that relates reaction rate to reactant concentrations.
  2. B. It is independent of concentration of reactant.
  3. C. It varies with temperature.
  4. D. Greater the value of rate constant slower is the reaction.

Answer

D. Greater the value of rate constant slower is the reaction.

Step-by-step solution

According to the rate law, the rate of a reaction is given by Rate = k[ Reactants ]^ n . Here, k is the rate constant, which is a proportionality constant relating the reaction rate to the reactant concentrations. The rate constant k is independent of the initial concentration of the reactants but depends on the temperature as given by the Arrhenius equation k = A e^ -E_a/RT . From the rate law, it is evident that the rate of the reaction is directly proportional to the rate constant k. Therefore, a greater value of the rate constant implies a faster reaction, not a slower one. Hence, the statement 'Greater the value of rate constant slower is the reaction' is incorrect. Answer: Greater the value of rate constant slower is the reaction.

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