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Which expression correctly gives the integrated rate law for a zero order reaction R -> P?
A[R] = [R]0 + kt
B[R] = [R]0 e^-kt
Cln[R] = ln[R]0 - kt
D[R] = [R]0 - kt
Answer & Solution
Correct answer: D. [R] = [R]0 - kt
1. For zero order, $-\dfrac{d[R]}{dt} = k$.
2. Integrating gives $[R] = -kt + I$ with $I = [R]_0$.
3. So $[R] = [R]_0 - kt$, a straight line of slope $-k$.
4. Options C and D are the first order forms, not zero order.
_Source: NCERT Class 12 Chemistry Ch 3 "Chemical Kinetics", p.11_
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