Ncert Exercises & Solutions

Which of the following statements is not correct about the order of a reaction?

1.	The order of a reaction can be a fractional number
2.	Order of a reaction is experimentally determined quantity
3.	The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants in the balanced chemical equation for a reaction
4.	The order of a reaction is the sum of the powers of the molar concentration of the reactants in the rate law expression

Hint: Order is sum of powers of the concentration of the reactants in the rate law expression

Step 1:

The order of the reaction is equal to the sum of powers of concentration of the reactants in rate law expression.

For any chemical reaction

$\begin{matrix} xA + yB \to Product \\ Rate = k [A]^{x} [B]^{γ} \\ Order = x + y \end{matrix}$

Step 2:

The order of reaction can be a fraction also. The order of the reaction is not always equal to the sum of the stoichiometric coefficients of reactants in the balanced chemical equation. For a reaction, it may or may not be equal to the sum of the stoichiometric coefficient of reactants.

Out of the given four statements, option (3) is not correct.

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