Mark the incorrect statement about molecularity and order of reaction:
Correct answer: D. D. Molecularity can be zero, and order of reaction must be a positive integer.
- A. A. Molecularity of a reaction is always an integer value.
- B. B. The order of a reaction is determined experimentally and can be a fraction.
- C. C. Molecularity is applicable to elementary reactions only.
- D. D. Molecularity can be zero, and order of reaction must be a positive integer.
Explanation
The correct answer is D. Molecularity refers to the number of molecules involved in an elementary reaction and must be a positive integer. It cannot be zero because that would imply no molecules are involved in the reaction. The order of a reaction is determined from experimental data and can be any real number, including fractions and negative values, which reflect the kinetics of the reaction rather than the stoichiometry.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Reaction Kinetics
Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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.
More Reaction Kinetics questions
A reaction in which catalyst is used is called catalysis. Which of the following is an example of heterogeneous catalysis?
The experimental relationship between rate of reaction and concentration of reactant is called:
Which of the following statements about order of reaction is incorrect?
The addition of a catalyst to the reaction system:
Rate of reaction increases by increasing temperature because:
As reaction starts instantaneous rate is :