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 one or two sentences.
What are the units for rate constants for zero-order and second-order reactions if time is expressed in seconds and concentration of reactants in mol/L?
Answer the following in one or two sentences.
Write the relationships between rate constant and half-life of the first order and zeroth-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
A first-order reaction takes 40 minutes for 30% decomposition. Calculate its half-life.
Derive the integrated rate law for the zeroth order reaction.
Explain pseudo first order reaction with a suitable example.
Explain with the help of a potential energy diagram that the catalyst increases the rate of the reaction.
For a first-order reaction, the rate constant is 6.909 min−1 the time taken for 75% conversion in minutes is
Describe the graphical representation of first order reaction.
From the following data, show that the decomposition of hydrogen peroxide is a reaction of the first order:
| t (min) | 0 | 10 | 20 |
| V (ml) | 46.1 | 29.8 | 19.3 |
Where t is the time in minutes and V is the volume of standard KMnO4 solution required for titrating the same volume of the reaction mixture.
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?
What is the value of rate constant of first order reaction, if it takes 15 minutes for consumption of 20% of reactants?
For first order reaction the concentration of reactant decreases from 0.2 to 0.1 M in 100 minutes. What is the rate constant of the reaction?
What is the order of reaction if the unit of rate constant (k) is mol dm−3 s−1?
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 ____________.
Which among the following is an example of zero order reaction?
A first order reaction takes 40 minutes for 30% completion. Calculate the half-life of reaction.
A first order reaction is 50% completed in 16 minutes. The percentage of reactant that will react in 32 minutes is ____________.
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?
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 integrated rate equation is Rt = log C0 – log Ct, then the straight-line graph is obtained by plotting.
Define the half-life of a first-order reaction.
Which of the following reactions is not of the first order?
Which among the following reactions is an example of pseudo first order reaction?
A radioactive isotope decayed to 17/32 of its original mass after 60 minutes. Find the half-life of this radioisotope.
