Advertisements
Advertisements
प्रश्न
Define the half-life of a first-order reaction.
Advertisements
उत्तर
The time in which concentration of reactant becomes half of its initial concentration is called half Life. It is denoted by `t_(1/2)`.
APPEARS IN
संबंधित प्रश्न
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
The half-life of a first-order reaction is 1.7 hours. How long will it take for 20% of the reactant to react?
Answer the following in brief.
What are the units of the rate constant?
Derive the integrated rate law for the zeroth order reaction.
Answer the following in brief.
Give one example and explain why it is pseudo-first-order.
Write units of rate constants for:
- First-order reaction
- Zero-order reaction
For a first order reaction \[\ce{A ->Product}\] with initial concentration x mol L−1, has a half life period of 2.5 hours. For the same reaction with initial concentration `("x"/2)` mol L−1 the half life is
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
For a first-order reaction, the rate constant is 6.909 min−1 the time taken for 75% conversion in minutes is
The rate constant of a reaction is 5.8 × 10−2 s−1. The order of the reaction is ____________.
Write the rate law for the following reaction.
A reaction that is `3/2` order in x and zero order in y.
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 following reactions follow zero order kinetics, EXCEPT ____________.
How long would it take to electroplate a spoon with 0.1 mol of silver (108 g/mol) at a constant current of 2.0 A using AgNO3?
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?
A reaction that is of the first order with respect to reactant A has a rate constant 6 min−1. If we start with [A]0 = 0.5 mol dm−3, when would [A] reach the value 0.05 mol dm−3?
Which among the following reaction is an example of a zero order reaction?
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?
For the first order reaction, plot of log10 [A]t against time 't' is a straight line with a negative slope equal to ____________.
A first order reaction is 75% completed in 60 minutes, the time required for it's 50% completion is ____________.
A first order reaction is 50% completed in 16 minutes. The percentage of reactant that will react in 32 minutes is ____________.
What is the unit of rate constant for the zero 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:
Which of the following reactions is not of the first order?
A radioactive isotope decayed to 17/32 of its original mass after 60 minutes. Find the half-life of this radioisotope.
The half-life of first order reaction is 1.7 hour. What is its rate constant?
Which of the following correctly represents integrated rate law equation for a first order reaction in a gas phase?
