Q57 / 180 · COMEDK 2026 (9 May Shift 1) · Chemistry

Rate law can be determined from a balanced chemical equation if

A
one of the reactants is in excess
B
it is a reversible reaction
C
there is a sequence of elementary reactions
Correct answer
D
it is an elementary reaction

Solution

For an elementary reaction, the reaction occurs in a single step. The molecularity of an elementary reaction is equal to its overall order. Therefore, the rate law can be written directly from the stoichiometric coefficients of the reactants in the balanced chemical equation.

Answer: it is an elementary reaction

Hence, the correct answer is option: 'D'.

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