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The rate of the reaction 2NO + Cl₂ → 2NOCl is given by the rate equation rate = k [NO]² [Cl₂]. The value of the rate constant can be increased by:

1. increasing the concentration of NO.
2. increasing the temperature.
3. increasing the concentration of the Cl₂
4. doing all of these

Correct answer: increasing the temperature.

Solution

The rate constant (k) is only affected by temperature, as it depends on the Arrhenius equation. Changing reactant concentrations does not alter k.

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