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Chemistry · Chemical Kinetics

NEET (UG) 2023 — Question 53

For a certain reaction, the rate =k[A]2[B]=k[A]^{2}[B], when the initial concentration of AA is tripled keeping concentration of B constant, the initial rate would

  1. Option A:

    increase by a factor of six

  2. Option B:

    increases by a factor of nine

    Correct
  3. Option C:

    increases by a factor of three

  4. Option D:

    decrease by a factor of nine

Answer: B

Step-by-step solution

Rate (r)=k[A]2[B](r)=k[A]^2[B] When concentration of AA is tripled

[A′]=[3 A]\left[\mathrm{A}^{\prime}\right]=[3 \mathrm{~A}]

New rate, r′=k[A′]2[B]=k[3A]2[B]=9k[A]2[B]r^{\prime}=k\left[A^{\prime}\right]^2[B]=k[3 A]^2[B]=9 k[A]^2[B]

r′=9rr^{\prime}=9 r

Answer key and solution verified before publishing.

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Exam
NEET (UG) 2023
Paper
2023 paper
Subject
Chemistry
Chapter
Chemical Kinetics
Topic
Rate Laws and Rate Constant

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