What will be the order of reaction of a reaction whose rate can be expressed as R = K [A] [B] ?
Correct answer: C. Two
- A. Zero
- B. One
- C. Two
- D. Three
Explanation
In R = K[A][B], the powers of the concentration terms are 1 and 1, so the overall order is 1 + 1 = 2. Students may choose one because each reactant has a first power, but overall order is the sum of all powers in the rate law.
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About Order of Reaction
Reaction order shows how the rate depends on the concentration of each reactant, as expressed in the rate law. Coverage includes zero, first and second-order reactions, integrated rate equations, half-life, units of rate constants and the distinction between overall order and molecularity.
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