Advertisements
Advertisements
प्रश्न
Give one example of a pseudo first-order reaction.
Advertisements
उत्तर १
Hydrolysis of methyl acetate:
\[\ce{CH3COOCH_{3(aq)} + H2O_{(l)} -> CH3COOH_{(aq)} + CH3OH_{(aq)}}\]
उत्तर २
Acid-catalysed hydrolysis of ethyl acetate
\[\ce{\underset{Ethyl acetate}{CH3COOC2H5} + H2O ->[H+] \underset{Acetic acid}{CH3COOH} + \underset{Ethyl alcohol}{C2H5OH}}\]
In this reaction, the concentration of water is so large that it practically remains constant.
The rate law of the reactions is
Rate = k0[CH3COOC2H5]
Hence, it is a pseudo-first-order reaction.
संबंधित प्रश्न
Answer the following in brief.
Obtain the relationship between the rate constant and half-life of a first-order reaction.
What are pseudo-first-order reactions?
In a first-order reaction, the concentration of the reactant decreases from 20 mmol dm−3 to 8 mmol dm−3 in 38 minutes. What is the half-life of reaction?
Solve
The half-life of a first-order reaction is 1.7 hours. How long will it take for 20% of the reactant to react?
Rate constant of a reaction is 3.6 × 10–3 s–1. The order of reaction is ______.
The rate of catalysed reaction is large than the uncatalysed reaction as _______.
What is half life of first order reaction if time required to decrease concentration of reactants from 0.8 M to 0.2 M is 12 hours?
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
This reaction follows first-order kinetics. The rate constant at particular temperature is 2.303 × 10−2 hour−1. The initial concentration of cyclopropane is 0.25 M. What will be the concentration of cyclopropane after 1806 minutes? (log 2 = 0.3010)
Write the rate law for the following reaction.
A reaction that is second order in NO and first order in Br2.
A first order reaction is 40% complete in 50 minutes. Calculate the value of the rate constant. In what time will the reaction be 80% complete?
A first order reaction has a rate constant 0.00813 min-1. How long will it take for 60% completion?
The following reactions follow zero order kinetics, EXCEPT ____________.
How long would it take to electroplate a spoon with 0.1 mol of silver (108 g/mol) at a constant current of 2.0 A using AgNO3?
The rate constant of a reaction has same units as the rate of reaction. The reaction is of ____________.
Reaction given below follows first order kinetics:
\[\ce{2N2O2 -> 4NO2 + O2}\]
Calculate the rate constant of reaction if concentration of N2O2 is 0.05 M and rate of reaction is 1.5 × 10−6 mol L−1 s−1?
The rate of formation of B at time t for reaction \[\ce{2A -> 3B}\] is equal to ____________.
For a first order reaction, \[\ce{A -> B}\], if [A] = 1 M and rate is 4 × 10−2 M s−1. What is the rate constant of the reaction?
Which among the following is an example of pseudo first order reaction?
In a reaction \[\ce{N2_{(g)} + 3H2_{(g)} -> 2NH3_{(g)}}\], if the rate of disappearance of N2(g) is 2.6 × 10−4 M/s, the rate of disappearance of H2(g) in M/s is ____________.
A certain zero order reaction has rate constant 0.025 M s-1. What will be the concentration of reactant 'A' after 15 seconds, if initial concentration is 0.50 M?
A first order reaction, A → B takes 100 minutes for it's 90% completion. What is the rate constant of reaction?
What is the unit of rate constant for the zero order reaction?
Which is the unit of rate constant for the first-order reaction if time is expressed in seconds?
Which one of the following reactions is a true first-order reaction?
Half-life of a first order reaction is 30 minutes and initial concentration of reactant is 0.1 M.
What is half-life of the reaction if initial concentration of reactant is doubled?
What are integrated rate laws?
Calculate half life of reaction if rate constant of first order reaction is 0.0178 minute−1.
