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.
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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.
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