Question:
An example of pseudo first order reaction is
An example of pseudo first order reaction is
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Hydrolysis reactions where water is the solvent are often pseudo first order.
Updated On: Apr 24, 2026
- Thermal decomposition of N\(_2\)O\(_5\)
- Inversion of cane sugar
- Decomposition of gaseous NH\(_3\) on hot Pt surface
- Radioactive decay of \(_{88}^{226}Ra\)
- Hydrogenation of ethene
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
A pseudo first order reaction is a reaction that is not truly first order but behaves like one because the concentration of one reactant is in large excess or remains constant.
Step 2: Detailed Explanation:
Inversion of cane sugar (sucrose) in the presence of an acid catalyst is a classic example. The reaction is: C\(_{12}\)H\(_{22}\)O\(_{11}\) + H\(_2\)O \(\rightarrow\) C\(_6\)H\(_{12}\)O\(_6\) (glucose) + C\(_6\)H\(_{12}\)O\(_6\) (fructose). Although two molecules are involved, the concentration of water is in large excess and remains effectively constant. Therefore, the rate depends only on the concentration of sucrose, making it pseudo first order.
Step 3: Final Answer:
Inversion of cane sugar is an example of a pseudo first order reaction.
A pseudo first order reaction is a reaction that is not truly first order but behaves like one because the concentration of one reactant is in large excess or remains constant.
Step 2: Detailed Explanation:
Inversion of cane sugar (sucrose) in the presence of an acid catalyst is a classic example. The reaction is: C\(_{12}\)H\(_{22}\)O\(_{11}\) + H\(_2\)O \(\rightarrow\) C\(_6\)H\(_{12}\)O\(_6\) (glucose) + C\(_6\)H\(_{12}\)O\(_6\) (fructose). Although two molecules are involved, the concentration of water is in large excess and remains effectively constant. Therefore, the rate depends only on the concentration of sucrose, making it pseudo first order.
Step 3: Final Answer:
Inversion of cane sugar is an example of a pseudo first order reaction.
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