The unit of the rate constant (k) is same as that of rate of reaction________________?
Correct answer: C. Zero order reaction
- A. First order reaction
- B. Second order reaction
- C. Zero order reaction
- D. Third order reaction
Explanation
For a zero-order reaction, rate = k, so the numerical value and units of k are the same as those of the reaction rate, commonly mol dm-3 s-1. In first-, second-, and third-order reactions, k has different units because it is multiplied by concentration terms. The likely mistake is choosing first order because k is often introduced with first-order equations, but only zero order makes rate and k directly identical.
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About Rate Constant
The rate constant, k, connects reaction rate with reactant concentrations in a rate law and has a value fixed for a particular reaction at a given temperature. Questions involve determining k from rate data, identifying its units for different reaction orders, and applying the Arrhenius equation to temperature changes.
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