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Consider the reaction, 2A + B → Products.
When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is:
1. L mol–1 s–1
2. no unit
3. mol L–1s–1
4. s–1
| 1. | A second-order reaction is always a multistep reaction. |
| 2. | A zero-order reaction is a multistep reaction. |
| 3. | A first-order reaction is always a single-step reaction. |
| 4. | A zero-order reaction is a single-step reaction. |