Select the correct rate law from given data
Correct answer: A. Rate = k[A][B]
- A. Rate = k[A][B]
- B. Rate = k[A][B]2
- C. Rate = k[A]2[B]
- D. Rate = k [B]2
Explanation
To calculate the order of A with respect to B take eq 1 & 2 [A2] / [A1] = 20 / 10 = 2 rate of reaction 2 / rate of reaction 1 = 4 x 10-5 / 2 x 10-5 = 2 order of A:- n ratio of concentrationn = ratio of rate => 2n = 2 => n = 1 --> [A] To calculate the order of B with respect to A take eq 1 & 3 [B3] / [B1] = 20 / 10 = 2 rate of reaction 3 / rate of reaction 1 = 4 x 10-5 / 2 x 10-5 = 2 order of B:- n ratio of concentrationn = ratio of rate => 2n = 2 => n = 1 --> [B] As both A and B are first order ∴ Rate = k[A][B]
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Reaction Kinetics
573 free Reaction Kinetics MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Reaction Kinetics questions
All are examples of fast reactions except;
The increase in reaction rate as a result of increase in temperature from 10K to 90K is
Rate of reaction increases with temperature for?
All those factors that change the _ affect rate of reaction.
Rate of formation of SO3 in the reaction 2SO2 + O2 → 2SO3 is 2 moles min-1. Hence rate of disappearance of SO2 will be:
Reaction kinetics is important to discover the _ under which reaction will proceed most economically: