AIIMS2012ChemistryChemical Kinetics

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

Options

AIf both assertion and reason are true and reason is the correct explanation of assertion
BIf both assertion and reason are true but reason is not the correct explanation of assertion
CIf assertion is true but reason is false
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 to question, [A₂ ]= [2 A₁ ] aligned & Rate ₂=k [2 A₁ ] & Rate ₂=2 Rate ₁ aligned For a given reaction, rate constant is constant and independent of the concentration of reactant.

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