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.
APPEARS IN
संबंधित प्रश्न
Answer the following in one or two sentences.
How do the half-lives of the first order and zero-order reactions change with the initial concentration of reactants?
Answer the following in brief.
How will you represent the zeroth-order reaction graphically?
What are pseudo-first-order reactions?
Answer the following in brief.
What is a zeroth-order reaction?
Answer the following in brief.
What are the units of the rate constant?
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
Give two examples for zero order reaction.
A zero order reaction is 20% complete in 20 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 rate of the reaction \[\ce{A + B -> C}\] is 3.6 × 10−2 mol dm−3 s−1 when [A] = 0.3 mol dm−3 and [B] = 0.2 mol dm−3. Calculate k if reaction is first order in A and zero order in B.
A first order reaction is 25% completed in 40 minutes. What is the rate constant k tor the reaction?
A first order reaction completes its 10% in 20 minutes, then the time required to complete its 19% is ____________.
The integrated rate equation for first-order reaction, A → product, is ______.
Which of the following represents the expression for `(3/4)^"th"` life of 1st order reaction?
The rate and the rate constants of the reaction, \[\ce{A + 2B -> C + D}\] are 8 × 10−3 mol dm−3 s−1 and 2 × 10−3 s−1 respectively. The concentrations of A and B are 4 mol dm−3 each. The overall order of the reaction is ____________.
For first order reaction the slope of the graph of log10 [A]t Vs. time is equal to ____________.
Which among the following is an example of zero order reaction?
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?
A first order reaction takes 40 minutes for 30% completion. Calculate the half-life of reaction.
Half-life of first order reaction is 20 minutes. What is the time taken to reduce the initial concentration of the reactant to `1/10`th?
Half-life of first-order reaction \[\ce{X -> Y + Z}\] is 3 minutes. What is the time required to reduce the concentration of 'X' by 90 % of it's initial concentration?
Which is the unit of rate constant for the first-order reaction if time is expressed in seconds?
For zero order reaction, when [A]t is plotted against time (t), the slope of the straight line obtained is equal to ______.
Which among the following reactions is an example of pseudo 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?
Consider the following reaction.
\[\ce{SO2(g) + 1/2 O2(g) <=>[K1] SO3(g)}\]
\[\ce{2SO3(g)<=>[K2] 2SO2(g) + O2(g)}\]
What is the relation between K1 and K2?
Which of the following correctly represents integrated rate law equation for a first order reaction in a gas phase?
