A reaction is first order with respect to A and second order with respect to B, the rate equation is
Correct answer: A. rate = [A] [B]2
- A. rate = [A] [B]2
- B. rate = k [A]2[B]
- C. rate = k [A] [B]
- D. rate = k [A]
Explanation
In this option the rate of the reaction is proportional to the product of the concentrations of A and B raised to the power of 2. This means that the rate of the reaction will increase as the concentration of A increases, and it will increase even more as the concentration of B increases.For example, if the concentration of A is doubled, the rate of the reaction will double. If the concentration of B is doubled, the rate of the reaction will quadruple ,hence the rate equation given in option 'a' suggests that reaction is of first order w.r.t A and of second order w.r.t B which matches the condition given in the question and is the correct answer.
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
As the hydrolysis of ester proceeds, more and more acid is formed giving a:
Specific rate constant changes its value with ?
Rate of reaction has :
A catalyst:
Which one of the following does NOT influence rate of reaction?
If the reaction 'P +Q → R+ S' is described as being of zero order with respect to P, it means that: