Advertisements
Advertisements
प्रश्न
What are pseudo-first-order reactions?
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.
संबंधित प्रश्न
Answer the following in brief.
Obtain the relationship between the rate constant and half-life of a first-order 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?
Write order of the following reaction:
\[\ce{2NH_{3(g)} -> N_{2(g)} + 3H_{2(g)}}\]
Write a mathematical expression for integrated rate law for zero-order reaction.
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.
Define half life of a reaction.
Write units of rate constants for:
- First-order reaction
- Zero-order reaction
Derive an expression for the relation between half-life and rate constant for first-order reaction.
For a first-order reaction, the rate constant is 6.909 min−1 the time taken for 75% conversion in minutes is
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 rate constant of a first order reaction is 3 × 10−6 per s. If the initial concentration is 0.10 mol dm−3, the initial rate of reaction is ____________.
In a first order reaction, the concentration of the reactant, decreases from 0.8 mol dm−3 to 0.4 mol dm−3 in 15 minutes. The time taken for the concentration to change from 0.1 mol dm−3 to 0.025 mol dm−3 is ____________.
If time required to decrease concentration of reactant from 0.8 M to 0.2 M is 12 hours, the half life of this first order reaction is ____________.
For first order reaction the slope of the graph of log10 [A]t Vs. time is equal to ____________.
In the reaction \[\ce{2SO2 + O2 -> 2SO3}\] the rate of appearance of SO3 is 4 × 10−4 M/s, the rate of disappearance of O2 is ____________.
The rate of formation of B at time t for reaction \[\ce{2A -> 3B}\] is equal to ____________.
Which among the following is an example of zero order reaction?
For the first order reaction A → B, the rate constant is 0.25 s-1, if the concentration of A is reduced to half, the value of rate constant will be ________.
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?
The integrated rate equation is Rt = log C0 – log Ct, then the straight-line graph is obtained by plotting.
Obtain the expression for half-life and rate constant of the 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?