Question:
The overall order of the following reaction is $KClO_3 + 6FeSO_4 + 3H_2SO_4 \rightarrow KCl + 3Fe_2(SO_4)_3 + 3H_2O$
The overall order of the following reaction is $KClO_3 + 6FeSO_4 + 3H_2SO_4 \rightarrow KCl + 3Fe_2(SO_4)_3 + 3H_2O$
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Never assume the order is the sum of coefficients in a balanced equation unless specifically stated that the reaction is elementary. Complex reactions involving many molecules almost always have low orders like 1 or 2.
Updated On: Jun 26, 2026
- ten
- six
- two
- three
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
The order of a reaction is an experimental quantity and cannot be determined directly from the stoichiometric coefficients of a balanced chemical equation for a complex reaction.
Step 2: Detailed Explanation:
1. The given reaction involves 10 reactant molecules. Such a high molecularity is impossible for a single-step (elementary) reaction.
2. This is a complex reaction occurring in multiple steps. The overall rate and order are determined by the slowest step (rate-determining step).
3. Experimental studies of this specific redox reaction between chlorate and iron(II) in acidic medium show that the overall order of the reaction is two. It is typically first order with respect to chlorate and first order with respect to $Fe^{2+}$.
Step 3: Final Answer:
The overall order of the reaction is two.
The order of a reaction is an experimental quantity and cannot be determined directly from the stoichiometric coefficients of a balanced chemical equation for a complex reaction.
Step 2: Detailed Explanation:
1. The given reaction involves 10 reactant molecules. Such a high molecularity is impossible for a single-step (elementary) reaction.
2. This is a complex reaction occurring in multiple steps. The overall rate and order are determined by the slowest step (rate-determining step).
3. Experimental studies of this specific redox reaction between chlorate and iron(II) in acidic medium show that the overall order of the reaction is two. It is typically first order with respect to chlorate and first order with respect to $Fe^{2+}$.
Step 3: Final Answer:
The overall order of the reaction is two.
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