Test: Rate law and rate constant - JEE MCQ
15 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Rate law and rate constant
In a certain polluted atmosphere containing O3 at a steady concentration of 2.0 x 10-6 M, the hourly production of O3 by all sources was estimated as 7.2 x 10-15 M. If the only mechanism for destruction of O3 in the second-order reaction is
2O3 → 3O2
then rate constant for destruction reaction, defined by the rate law for - Δ[O3]/Δf is x * 10-7 M-1 s-1 . What is the value of x?
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For a reversible reaction, net rate is
(dx/dt) = k1[A]2[B]−1−k2[C]
hence given reaction is
The rate constants for a reaction at 400 K and 500 K are 2.60 x 10-5 s-1 and 2.60 x 10-3 s-1,respectively. The activation energy of the reaction in kJmol-1 is ______
A reaction rate constant is given by k=1.2×1014 e−25000/RTsec−1. It means
The time required for 10% completion of a first order reaction at 298K is equal to that required for its 25% completion at 308K If the preexponential factor for the reaction is 3.56 x 109 s-1, the activation energy at 318K is:
...(i)
...(ii)
In a reaction A → Products, when start is made from 8.0 × 10−2 M of A, half-life is found to be 120 minute. For the initial concentration 4.0 × 10−2 M, the half-life of the reaction becomes 240 minute. The order of the reaction is:
For the reaction A + B⟶ products, it is observed that:
(1) On doubling the initial concentration of A only, the rate of reaction is also doubled and
(2) On doubling the initial concentrations of both A and B, there is a change by a factor of 8 in the rate of the reaction. The rate of this reaction is given by:
, is zero. It implies that:
is zero. 
.The rate law for the reaction below is given by the expression k[A][B]
A + B → Product
If the concentration of B is increased from 0.1 to 0.3 mole, keeping the value of A at 0.1 mole, the rate constant will be:
Thus reaction is of 
orderI
Products, 
II
Products, 
The half-lives of both the reactions are the same, equal to
when molar concentration of the reactant is 
in each case. If these reactions are started at the same time taking 
of the reactant in each case, the ratio 
after 
will be :
indicate that reaction 
is of second order and reaction 
is first order. For 
reaction, 
, first 
, second 
when the concentration of the reactant is 
The rate constant of the reaction will be
and 
. The rate constants were found to be 
and 
respectively. then
rise in temperature. For 
rise, the rate constant will be 4 times 
or 
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