NEET 2023 Phase 2 · ChemistryRate lawPrevious Year Question

The correct option for the rate law that corresponds to an overall first order reaction is

Answer: (B) $Rate = k [A]^{- 1/2} [B]^{3/2}$ . \textbf{Answer:} (B) $Rate = k [A]^{- 1/2} [B]^{3/2}$ \textbf{Solution:} The overall order equals the sum of the exponents (partial orders) in the rate law.

A. $Rate = k [A]^{1/2} [B]^{2}$
B. $Rate = k [A]^{- 1/2} [B]^{3/2}$ ✓
C. $Rate = k [A]^{0} [B]^{2}$
D. $Rate = k [A] [B]$

Correct Answer

(B) $Rate = k [A]^{- 1/2} [B]^{3/2}$

Solution & Explanation

\textbf{Answer:} (B) $Rate = k [A]^{- 1/2} [B]^{3/2}$ \textbf{Solution:} The overall order equals the sum of the exponents (partial orders) in the rate law. Checking each: (A) $\frac{1}{2} + 2 = \frac{5}{2}$ (B) $- \frac{1}{2} + \frac{3}{2} = 1$ (C) $0 + 2 = 2$ (D) $1 + 1 = 2$ Only option (B) gives an overall order of 1.

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