(i) The rate of a reaction decreases over time as the concentration of reactants decreases.

(ii) The rate of a reaction is the same at any time during the reaction.

(iii) The rate of a reaction is independent of temperature change.

(iv) The rate of a reaction decreases with increase in the concentration of the reactant

Correct Answer: (i) The rate of a reaction decreases over time as the concentration of reactants decreases

Explanation: The rate of a reaction is not the same at any time during the reaction and is also dependent on the temperature change. The rate of the reaction increases when the concentration of the reactant decreases.