Question:

The rate law for the reaction below is given by the expression \(k\,[A][B]\)
\(A + B \rightarrow \text{Product}\)
If the concentration of B is increased from 0.1 to 0.3 mole, keeping the value of A at 0.1 mole, the rate constant will be :

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The rate constant depends only on temperature (and catalyst), not on concentrations.
Updated On: Nov 11, 2026
  • \(k\)
  • \(k/3\)
  • \(3k\)
  • \(9k\)
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The Correct Option is A

Solution and Explanation

Rate \(= k[A][B]\). Changing the concentration of B changes the rate (it becomes three times), but the rate constant \(k\) is independent of concentration and depends only on temperature.
So the rate constant remains \(k\).
Answer: (1) \(k\)
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