NEET Chemistry Chemical Kinetics MCQs

For a reaction A + B → C, the rate law is found to be Rate = k[A]²[B]⁻¹. If the concentration of A is tripled while keeping the concentration of B constant, the factor by which the reaction rate changes is:

A reaction follows the rate law: Rate = k[A][B]². If the initial concentrations of both A and B are doubled, and the temperature remains constant, the initial rate of the reaction will increase by a factor of:

For a zero-order reaction, the plot of concentration of reactant versus time is:

The half-life of a first-order reaction is 20 minutes. What fraction of the reactant remains after 80 minutes?

A reaction has a rate constant 'k' at temperature T₁ and k' at T₂ (T₂ > T₁). If the activation energy is Ea, which expression correctly relates k, k', T₁, and T₂ according to the Arrhenius equation?

A reaction between gases X and Y follows the rate law: Rate = k[X]²[Y]. If the concentration of X is tripled and the concentration of Y is halved, the new rate will be:

Two molecules A and B collide, but no reaction occurs. Which of the following MUST be true?

The pre-exponential factor (A) in the Arrhenius equation is related to the:

The hydrolysis of tert-butyl bromide in an aqueous medium follows the $S_N1$ mechanism. If the concentration of tert-butyl bromide is doubled, and the concentration of water is tripled, how will the rate of the reaction be affected?

A reaction $A + B \rightarrow C$ follows the rate law: Rate = $k[A]^{1/2}[B]^2$. If the concentrations of both A and B are halved, the rate of the reaction will become: