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A reaction is first order with respect to A and second order with respect to B, the rate equation is

Correct answer: A. rate = k [A] [B]2

  • A. rate = k [A] [B]2
  • B. rate = k [A]2[B]
  • C. rate = k [A] [B]
  • D. rate = k [A]

Explanation

The correct rate equation is rate = k [A] [B]2. This equation correctly reflects that the reaction is first order with respect to A and second order with respect to B. This means that the rate will double if the concentration of A is doubled and quadruple if the concentration of B is doubled. The other options do not match the given conditions: Option B suggests a second order with respect to A, Option C suggests first order for both A and B, and Option D suggests zero order with respect to B.

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About Reaction Kinetics

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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