Medium
What is a pseudo first order reaction? Give an example of a pseudo first order reaction.
(N/A) pseudo first order reaction is a reaction that is actually of a higher order (usually second order) but behaves as a first order reaction under certain experimental conditions,such as when one reactant is present in a large excess.
Example: The acid-catalyzed hydrolysis of ethyl acetate $(CH_3COOC_2H_5 + H_2O \xrightarrow{H^+} CH_3COOH + C_2H_5OH)$.
In this reaction,the concentration of water is in such a large excess that it remains effectively constant throughout the reaction. Therefore,the rate law becomes $Rate = k[CH_3COOC_2H_5][H_2O] \approx k'[CH_3COOC_2H_5]$,where $k' = k[H_2O]$.
Example: The acid-catalyzed hydrolysis of ethyl acetate $(CH_3COOC_2H_5 + H_2O \xrightarrow{H^+} CH_3COOH + C_2H_5OH)$.
In this reaction,the concentration of water is in such a large excess that it remains effectively constant throughout the reaction. Therefore,the rate law becomes $Rate = k[CH_3COOC_2H_5][H_2O] \approx k'[CH_3COOC_2H_5]$,where $k' = k[H_2O]$.
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The mechanism for the reaction is given below:
$2P + Q \to S + T$
$P + Q \to R + S$ (slow)
$P + R \to T$ (fast)
The rate law expression for the reaction is:
$2P + Q \to S + T$
$P + Q \to R + S$ (slow)
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The rate law expression for the reaction is:
Medium
View SolutionReaction: $KClO_3 + 6FeSO_4 + 3H_2SO_4 \to KCl + 3Fe_2(SO_4)_3 + 3H_2O$
Which is True $(T)$ and False $(F)$ in the following statement?
The order of this reaction is $1$.
Which is True $(T)$ and False $(F)$ in the following statement?
The order of this reaction is $1$.
Easy
View SolutionThe rate law for the reaction $A + B \rightarrow P$ is given by $\text{rate} = k[A]^2[B]$. The rate constant of the reaction at $300 \text{ K}$ is $6.0 \text{ M}^{-2} \text{s}^{-1}$. Calculate the rate of the reaction when $[A] = 1 \text{ M}$ and $[B] = 0.2 \text{ M}$. (in $\text{ M s}^{-1}$)
DifficultMHT CET 2026
View SolutionFor a reaction $A \to B$,the rate of reaction quadrupled when the concentration of $A$ is doubled. The rate expression of the reaction is $r = K[A]^n$. The value of $n$ is
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$(1)$ Rate law / Rate equation / Rate expression
$(2)$ Unimolecular reaction
$(1)$ Rate law / Rate equation / Rate expression
$(2)$ Unimolecular reaction
Medium
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