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The rate of a reaction is the speed at which the reactants are converted into products. It depends upon the concentration of reactants. A + B → Product; r ∝ [A][B]

1. By decreasing volume of gas or increasing pressure of it, concentration will increase.
2. By increasing temperature, rate will increase.
3. By increasing concentration of reactants, rate will increase.
4. All of the above.

Correct answer: All of the above.

Solution

All the given options correctly describe factors that can increase the rate of a reaction: decreasing volume or increasing pressure increases concentration, higher temperature increases kinetic energy, and higher reactant concentration increases collision frequency.

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