Order of reaction is the number of reacting molecules whose concentration alters as a result of chemical change. For which order of reaction, the unit of rate constant (k) is the same as that of rate of reaction?
Correct answer: C. Zero order reaction
- A. 1st order reaction
- B. 2nd order reaction
- C. Zero order reaction
- D. 3rd order reaction
Explanation
r=k[A]x [B]yIn this reaction r= rate of reaction and k = rate constant, [A] and B] are the concentration of the reactant A and B . x and y are the order of the reactions. If the rate constant has the same unit as the rate of reaction, the total order of the reaction will be zero. Hence, zero is the order of the reaction, whose rate constant has the same unit as the rate of reaction.
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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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