Advertisements
Advertisements
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?
Advertisements
उत्तर
i. The half-life of the first-order reaction is independent of the initial concentration of the reactant.
ii. The half-life of zero-order reactions is proportional to the initial concentration of the reactant.
APPEARS IN
संबंधित प्रश्न
Answer the following in brief.
How will you represent the zeroth-order reaction graphically?
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
A first-order reaction takes 40 minutes for 30% decomposition. Calculate its half-life.
Answer the following in brief.
What are the units of the rate constant?
Answer the following in brief.
Give one example and explain why it is pseudo-first-order.
Rate constant of a reaction is 3.6 × 10–3 s–1. The order of reaction is ______.
Explain pseudo first order reaction with a suitable example.
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
If 75% of a first order reaction was completed in 60 minutes, 50% of the same reaction under the same conditions would be completed in ____________.
The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds?
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.
The time of completion of 90% of a first order reaction is approximately ____________.
Which among the following reaction is an example of a zero order reaction?
The rate constant of a reaction has same units as the rate of reaction. The reaction is of ____________.
If [A] is the concentration of A at any time t and [A]0 is the concentration at t = 0, then for the 1st order reaction, the rate equation can be written as ____________.
Which of the following represents the expression for `(3/4)^"th"` life of 1st order reaction?
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 ____________.
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?
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 ________.
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?
Define the half-life of a first-order reaction.
Which among the following reactions is an example of pseudo first order reaction?
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?
Which of the following correctly represents integrated rate law equation for a first order reaction in a gas phase?
Calculate the time required to decrease the concentration of reactant of first order reaction from 0.8 M to 0.1 M if rate constant is 0.1155 hour−1.
