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For a zero-order reaction, the unit of rate constant is ________.
- s⁻¹
- mol L⁻¹ s⁻¹
- L mol⁻¹ s⁻¹
- mol² L⁻² s⁻¹
Answer: mol L⁻¹ s⁻¹
Zero-order: rate = k, so k has same units as rate (concentration/time). First-order: s⁻¹; Second-order: L mol⁻¹ s⁻¹. Unit analysis helps identify reaction order. [[NCERT Chemistry Class 12]]