Prepare for NEET Chemistry Chemical Kinetics with MCQs & PYQs on NEET.GUIDE. Get free practice, previous year questions, and expert explanations to master reaction rates and mechanisms.
Two molecules A and B collide, but no reaction occurs. Which of the following MUST be true?
The molecules did not collide with the correct orientation.
The molecules are not reactive under any conditions.
The collision did not have sufficient energy to overcome the activation energy barrier.
The temperature of the system is too low for any reaction to occur.
According to collision theory, which factor does NOT significantly affect the rate of a reaction?
The orientation of the colliding molecules
The kinetic energy of the colliding molecules
The frequency of collisions between molecules
The size of the reaction vessel
Increasing the temperature of a reaction generally increases the reaction rate. Which aspect of collision theory best explains this observation?
Increased temperature reduces the activation energy of the reaction.
Increased temperature changes the orientation of the colliding molecules.
Increased temperature decreases the frequency of collisions between molecules.
Increased kinetic energy of molecules leads to more collisions exceeding the activation energy.
Which statement best describes the relationship between activation energy and reaction rate?
Reactions with higher activation energies generally proceed faster.
Activation energy has no effect on reaction rate.
The relationship between activation energy and reaction rate is unpredictable.
Reactions with lower activation energies generally proceed faster.
Consider two reactions, A and B. Reaction A has a higher activation energy than reaction B. Which statement is most likely true?
Reaction A will proceed faster than reaction B at the same temperature.
Both reactions will proceed at the same rate at the same temperature.
Reaction B will proceed faster than reaction A at the same temperature.
The relative rates of reactions A and B cannot be predicted based on activation energy alone.
Increasing the temperature generally increases the reaction rate because:
The activation energy decreases
More molecules have sufficient energy to react
The concentration of reactants increases
The molecules become larger
Which factor does NOT directly influence the rate of a reaction according to collision theory?
Reactant concentration
Temperature
Activation energy
Product concentration
Collision theory explains reaction rates in terms of:
The size of the reactant molecules
The color of the reactants
Effective collisions between reactant molecules
The density of the reactants
The rate of a specific chemical reaction is significantly increased by the introduction of a catalyst. Which of these factors associated with the reaction remains unaltered?
Enthalpy change (\u0394H)
Activation energy
Rate of the forward reaction
Rate of the reverse reaction
Which of these does NOT describe the impact of a catalyst on a chemical reaction?
Increases the rate of the reaction
Lowers the activation energy
Changes the enthalpy of the reaction
Provides an alternative reaction pathway
