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Pseudo First Order Reaction Video Lecture | Chemistry for JEE Main & Advanced

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FAQs on Pseudo First Order Reaction Video Lecture - Chemistry for JEE Main & Advanced

1. What is a pseudo first-order reaction?
Ans. A pseudo first-order reaction is a type of chemical reaction that appears to follow first-order kinetics, even though the reaction is actually a higher-order reaction. This occurs when one reactant is present in excess compared to the other reactant, resulting in the concentration of the excess reactant remaining approximately constant throughout the reaction.
2. How does a pseudo first-order reaction differ from a true first-order reaction?
Ans. In a true first-order reaction, the rate of the reaction depends solely on the concentration of a single reactant. In contrast, a pseudo first-order reaction involves multiple reactants, but one reactant is present in excess and its concentration remains approximately constant. This leads to the reaction appearing to follow first-order kinetics, even though it is actually a higher-order reaction.
3. What are some examples of pseudo first-order reactions?
Ans. One common example of a pseudo first-order reaction is the hydrolysis of esters in the presence of excess water. The concentration of water remains constant, while the concentration of the ester decreases over time. This makes the reaction appear to follow first-order kinetics. Another example is the reaction between a colored compound and a bleaching agent, where the concentration of the bleaching agent remains constant.
4. How can the rate constant of a pseudo first-order reaction be determined?
Ans. The rate constant of a pseudo first-order reaction can be determined by plotting the natural logarithm of the concentration of the reactant that is not in excess against time. The slope of the resulting linear graph is equal to the rate constant. This method is known as the integrated rate equation for a pseudo first-order reaction.
5. What factors can affect the rate of a pseudo first-order reaction?
Ans. The rate of a pseudo first-order reaction can be influenced by various factors. These include the initial concentrations of the reactants, temperature, and the presence of catalysts. Additionally, the rate may also be affected by the physical conditions of the reaction, such as pressure or solvent choice. It is crucial to consider these factors when studying and analyzing pseudo first-order reactions.
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