Which is the unit of (K) rate constant for zero order reaction ?
Correct answer: B. mol dm-3 s-1
- A. s-1
- B. mol dm-3 s-1
- C. mol-1 dm3 s-1
- D. mol-2 dm6 s-1
Explanation
For a zero-order reaction, rate = k, so k has the same dimensions as rate: concentration per time. Therefore its unit is mol dm^-3 s^-1. The common wrong choice is s^-1, which is the unit of a first-order rate constant, not a zero-order rate constant.
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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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