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

Question

Assertion: Rate of reaction doubles when concentration of reactant is doubled if it is a first order reaction. Reason: Rate constant also doubles. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

For first order reaction, Rate 1=k[A1] According to question, [ A 2]=[2 A 1] ∴ Rate 2= k [2 A 1] ⇒ Rate 2=2 Rate 1 For a given reaction, rate constant is constant and independent of the concentration of reactant.

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

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

For first order reaction, Rate $_{1} = k [A_{1}]$
According to question, $[A_{2}] = [2 A_{1}]$
$∴$ Rate $_{2} = k [2 A_{1}]$
$\Rightarrow$ Rate $_{2} = 2$ Rate $_{1}$
For a given reaction, rate constant is constant and independent of the concentration of reactant.

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