On increasing the temperature the rate of reaction increases mainly because_________________?
Correct answer: C. Collision frequency increases
- A. The activation energy of the reaction increases
- B. Concentration of the reacting molecules increases
- C. Collision frequency increases
- D. None of these
Explanation
Heating gives reacting molecules more kinetic energy, so they collide more frequently and a greater fraction of collisions has enough energy to cross the activation-energy barrier. The activation energy and concentration do not normally increase just because temperature rises. Students often choose a by thinking faster reaction means a higher activation energy, but a catalyst, not heating, lowers activation energy.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Factors Affecting Rate of Reaction
Reaction rate depends on the nature and concentration of reactants, pressure for gases, temperature, surface area and catalysts. Collision theory explains these effects through collision frequency, orientation and activation energy, while questions often distinguish a catalyst's effect on reaction rate from its lack of effect on equilibrium composition.
Practise Reaction Kinetics
573 free Reaction Kinetics MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.