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What are pseudo-first-order reactions? - Chemistry

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प्रश्न

What are pseudo-first-order reactions?

थोडक्यात उत्तर
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उत्तर

Certain reactions that are expected to be of higher order follow the first-order kinetics. Such reactions are said to be pseudo-first-order reactions.

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पाठ 6: Chemical Kinetics - Exercises [पृष्ठ १३६]

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बालभारती Chemistry [English] Standard 12 Maharashtra State Board
पाठ 6 Chemical Kinetics
Exercises | Q 3. vi. a. | पृष्ठ १३६

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.

Obtain the relationship between the rate constant and half-life of a first-order reaction.


How will you represent first order reactions graphically.


Derive the integrated rate law for the zeroth order reaction. 


Rate constant of a reaction is 3.6 × 10–3 s–1. The order of reaction is ______.


For the reaction 2NOBr → 2NO2 + Br2, the rate law is rate = k[NOBr]2. If the rate of a reaction is 6.5 × 10–6 mol L–1 s–1, when the concentration of NOBr is 2 × 10–3 mol L–1. What would be the rate constant of the reaction?


Explain with the help of a potential energy diagram that the catalyst increases the rate of the reaction.


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)


Assertion: rate of reaction doubles when the concentration of the reactant is doubles if it is a first-order reaction.

Reason: rate constant also doubles.


Give two examples for zero order reaction.


The following reactions follow zero order kinetics, EXCEPT ____________.


If [A]0 is the initial concentration, then the half life of zero order reaction is ____________.


The activation energy of a reaction is zero. Its rate constant at 280 K is 1.6 × 10-6 s-1, the rate constant at 300 K is ______.


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 ____________.


The order of the reaction for which the unit of rate constant is s−1 is ____________.


The half-life of a first order reaction is 6.0 hour. How long will it take for the concentration of reactant to decrease from 0.4 M to 0.12 M?


Which among the following is an example of zero order reaction?


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?


Rate constant for zero order reaction is 2 × 10-2 mol L-1 s-1. If the concentration of the reactant after 25 sec. is 0.5 M, what is the initial concentration of reactant?


The expression to calculate time required for completion of zero order reaction is ______.


Obtain the expression for half-life and rate constant of the first-order reaction.


Define the half-life of a first-order reaction.


If the rate constant for a first-order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:


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?


A radioactive isotope decayed to 17/32 of its original mass after 60 minutes. Find the half-life of this radioisotope.


What is the rate constant of a first order reaction if 0.08 mole of reactant reduces to 0.02 mole in 23.03 minutes?


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