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Which statement best defines the rate law (rate expression) of a chemical reaction?
ARate equals the product of all reactant coefficients
BRate is independent of reactant concentrations always
CRate is concentration of reactants raised to experimental powers
DRate is the equilibrium constant of the reaction
Answer & Solution
Correct answer: C. Rate is concentration of reactants raised to experimental powers
1. The rate law expresses rate in terms of molar concentrations of reactants.
2. Each concentration term is raised to a power found by experiment.
3. These powers may or may not equal the stoichiometric coefficients.
4. So option C captures the definition; the powers are not fixed by the balanced equation.
_Source: NCERT Class 12 Chemistry Ch 3 "Chemical Kinetics", p.6_
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