AIPMT PRELIMS2012Chemistry-Chemical Kinetics
AIPMT PRELIMS 2012 Chemistry Rate Laws MCQ Question
Type: MCQ-numerical-Hard-Class 12
In a reaction, A + B → Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, rate law for the reaction can be written as:
A
Rate = k[A]² [B]
B
Rate = k[A] [B]²
C
Rate = k[A]² [B]²
D
Rate = k[A] [B]
Correct Answer
Option A
Detailed Explanation
r₁ = [A]ⁿ[B]ʸ, r₂ = [A]ⁿ[2B]ʸ = 2r₁ = 2×[A]ⁿ[B]ʸ ⇒ 2ʸ = 2 ⇒ y = 1, r₃ = [2A]ⁿ[2B]ʸ = 8r₁ = 8×[A]ⁿ[B]ʸ = 2ⁿ × 2ʸ = 2³ = 2ⁿ = 2², Rate = k [A]² [B].
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