alleryA rate constant has units of L mol⁻¹ s⁻¹. The order of the reaction is:
AZero
BThird
CFirst
DSecond
Answer & Solution
Correct answer: D. Second
**Second-order:** Rate = k[A]²
→ k = Rate/[A]² = (mol L⁻¹ s⁻¹)/(mol L⁻¹)² = **L mol⁻¹ s⁻¹**.
(NEET shortcut: in general, units of k = mol^(1−n) L^(n−1) s⁻¹ for n-th order.)
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