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AIIMS 2012
Exam
AIIMS
Year
2012
Subject
Chemistry
Chapter
Chemical Kinetics

AIIMS 2012 · Chemistry · Chemical Kinetics

Assertion : Rate of reaction doubles when concentration of reactant...

Assertion : Rate of reaction doubles when concentration of reactant is doubled if it is a first order reaction.Reason : Rate constant also doubles.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

For first order reaction, Rate⁡1=k[A1]According\operatorname{Rate}_1=k \left[A_1\right] According to question,[A2]=[2A1]question, \left[A_2\right]=\left[2 A_1\right]∴ Rate 2=k[2A1]⇒ Rate 2=2 Rate 1\begin{aligned} & \therefore \text{ Rate }_2=k\left[2 A_1\right] \\ & \Rightarrow \text{ Rate }_2=2 \text{ Rate }_1 \end{aligned}$$ For a given reaction, rate constant is constant and independent of the concentration of reactant.
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