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For the reaction A + B -> Product, the rate law is r = k[A]^1/2 [B]^2. What is the order of the reaction?
A2.5
B2.0
C1.5
D3.0
Answer & Solution
Correct answer: A. 2.5
1. Order is the sum of the powers in the rate law.
2. Order $= \tfrac{1}{2} + 2$.
3. $= 2.5$, a fractional overall order.
_Source: NCERT Class 12 Chemistry Ch 3 "Chemical Kinetics", p.10_
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