NEET Chemistry: Collision Theory Practice Questions

Q1. In the context of bimolecular reactions, what physical attribute of the colliding molecules is crucial for determining their ability to react?

• AThe number density of the reacting species.
• BThe total translational energy.
• CThe magnitude of their relative velocity.
• DThe overall pressure exerted by the system.

Q2. If molecules are assumed to be point masses and ignore rotational and translational energy differences, which postulate of Collision Theory is being implicitly considered?

• AThe frequency of collisions is constant.
• BThe molecules are hard spheres with defined interaction volume.
• CThe kinetic energy of molecules is continuously distributed.
• DThe actual trajectory of the molecules is deterministic.

Q3. Which of the following is the primary requirement for a collision between reactant molecules to be effective in a chemical reaction according to Collision Theory?

• AThe molecules must possess sufficient kinetic energy.
• BThe molecules must be perfectly aligned in a linear fashion.
• CMolecules must be in a gaseous state.
• DThe collision must occur at standard temperature.

Q4. The concept of 'collision cross-section' (σ) in Collision Theory relates to which aspect of a reaction?

• AThe total volume occupied by the reactants
• BThe total energy released during the reaction
• CThe effective area for successful collisions
• DThe activation energy required for the reaction

Q5. In collision theory, a chemical reaction can only occur if the colliding molecules possess a certain minimum energy and proper orientation. What factor primarily determines the extent to which collisions lead to a chemical reaction?

• AThe total number of collisions per second
• BThe temperature of the system
• CThe frequency of collisions between molecules
• DThe energy of the collisions and the proper orientation

Q6. How does increasing the absolute temperature affect the rate of gaseous reactions based on collision theory?

• AIt increases the rate only if the activation energy is zero.
• BIt increases the rate because the average kinetic energy and collision frequency increase.
• CIt decreases the rate because molecules move slower.
• DIt does not affect the reaction rate as collisions are independent of temperature.

Q7. The orientation factor in the context of bimolecular gaseous reactions is important because it accounts for what aspect?

• AThe change in potential energy during collision
• BThe total kinetic energy of the colliding molecules
• CThe temperature dependence of the reaction rate
• DThe geometrical arrangement necessary for bond breaking and formation

Q8. Which statement accurately describes the role of the activation energy (Eₐ) in a bimolecular gaseous reaction according to Collision Theory?

• AIt dictates the frequency of collisions between molecules.
• BIt determines the total number of collisions per unit time.
• CIt is directly proportional to the reaction rate.
• DIt represents the minimum energy required for the collision to lead to a reaction.

Q9. What is the role of the steric factor in a bimolecular gaseous reaction according to collision theory?

• AIt specifies the minimum kinetic energy required for reaction.
• BIt determines the total number of collisions occurring per unit time.
• CIt accounts for the probability that the colliding molecules have the correct spatial orientation.
• DIt defines the activation energy of the reaction.

Q10. Which statement best describes the requirement for a collision to be 'effective' in the context of Collision Theory?

• AThe collision must have sufficient energy and correct orientation.
• BThe collision must be spontaneous in direction.
• CThe collision must be exothermic.
• DThe collision must occur only between molecules of the same type.

Q11. For a bimolecular reaction to occur successfully according to Collision Theory, what must be satisfied regarding the colliding molecules?

• AThey must be moving in the same direction
• BThey must have the same mass
• CThey must be in the same phase
• DThey must collide with sufficient kinetic energy and proper orientation

Q12. Which of the following factors primarily determines the rate of a gaseous reaction according to Collision Theory?

• AThe fraction of collisions that occur with sufficient energy (activation energy)
• BThe total number of molecules in the system
• CThe total kinetic energy of the molecules
• DThe volume occupied by the reacting gases

Q13. What is the primary requirement for two gaseous molecules to undergo a reaction according to Collision Theory?

• AThey must possess sufficient kinetic energy and proper orientation.
• BThey must be in the same phase.
• CThey must be in thermal equilibrium.
• DThey must have zero potential energy.

Q14. In a bimolecular gaseous reaction, what factor determines the proportion of collisions that lead to a reaction, assuming all molecules are equally likely to collide?

• AThe total number of collisions.
• BThe volume of the container.
• CThe fraction of molecules with energy greater than Eₐ.
• DThe total kinetic energy of the system.

Q15. In Collision Theory, what primarily determines the rate of a bimolecular reaction between two gaseous molecules?

• AThe frequency of effective collisions
• BThe total kinetic energy of the molecules
• CThe temperature of the system
• DThe total number of molecules present in the container