JEE Questions for Chemistry Chemical Kinetics Quiz 5 - MCQExams.com

Increase in the concentration of the reactants leads to the change in
  • heat of reaction
  • threshold energy
  • collision energy
  • activation energy
Energy of activation of an exothermic reaction is
  • zero
  • negative
  • positive
  • can not be predicated
The chemical reactions in which reactants require high amount of activation energy are generally ................
  • slow
  • fast
  • instantaneous
  • spontaneous
The rate of reaction increases with increase of temperature because ...
  • an increase in the number of activated molecules
  • an increase in the number of collisions
  • lowering of threshold energy
  • activation energy is lowered
The activation energy of reaction is equal to
  • Threshold energy + Energy of the products
  • Threshold energy - Energy of the reactants
  • Threshold energy + Energy of the reactants
  • Threshold energy - Energy of the products
Collision theory is most satisfactory for ___________ reaction.
  • First order
  • second order
  • Bimolecular
  • Any
If Ef and Er are the activation energies of the forward and reverse reactions and the reaction is known to be exothermic then
  • Ef < Er
  • Ef > Er
  • Ef >>> Er
  • Ef = Er
For a an endothermic reaction, ∆H represents the enthalpy of reaction. The minimum value for the energy of activation will be ...
  • equal to ∆H
  • zero
  • more than ∆H
  • less than ∆H
For an endothermic reaction A → B. An activation energy of 15 Kcal mole-1 and the enthalpy change of reaction is 5 Kcal mole-1. The activation energy for the reaction B → A is
  • 10 Kcal mole-1
  • 20 Kcal mole-1
  • 15 Kcal mole-1
  • zero
The Plot of log K vs 1/T helps to calculate
  • Activation energy
  • Rate constant
  • Reaction order
  • Activation energy and frequency factor
The increase in reaction rate as a result of temperature rise from 10 K to 100 K is ...
  • 512
  • 614
  • 400
  • 112
At 300 K rate constant is 0.0231 min-1, for a reaction. Bt at 320 K rate constant is 0.0693 min-1.The activation energy of the reaction is
  • 84 KJ mole-1
  • 34.84 KJ mole-1
  • 43.84 KJ mole-1
  • 30 KJ mole-1
The activation energy of a reaction is 9 Kcal mole-1. The increase in the rate constant when its temperature is raised from 295 to 300 K is approximately
  • 1.289 times
  • 12.89 times
  • 0.1289 times
  • 25%
The rate of reaction 2x + y → Products. Rate = K[x]2[y]. If x is present in large excess, the order of the reaction is
  • 3
  • 2
  • 1
  • 0

Chemistry-Chemical Kinetics-1604.png
  • 0
  • 1
  • 2
  • 3
In which of the following cases, does the reaction go farthest to completion ?
  • K = 100
  • K = 10-2
  • K = 10
  • K = 1
What will be the order of the reaction if doubling the concentration of a reactant increases the rate by a factor of 4 and trebling the concentration of the reactant by a factor of 9 ?
  • 1
  • 2
  • 3
  • 0
If the half time for a particular reaction is found to be constant and independent of the initial concentration of the reactants then reaction is of ...
  • 1
  • 2
  • 3
  • 0
The rate of reaction A + B + C → Products is given by r = K[A][B]o[C]. If A is taken in large excess, the order of the reaction would be
  • 0
  • 1
  • 2
  • nil
For a reaction 2A + B → Products, the active mass of B is kept constant and that of A is doubled. The rate of reaction will then
  • increase two times
  • increase four times
  • decrease two times
  • decrease four times
The conversion of A → B follows second order kinetics. Doubling the concentration of A will increase the rate of formation B by a factor of
  • 1⁄4
  • 2
  • 1⁄2
  • 4
Ethyl acetate is hydrolysed in alkaline medium, its order of a reaction and molecularity are respectively
  • 1, 1
  • 1, 2
  • 2, 1
  • 2, 2
The given reaction 2FeCl3 + SnCl2 → 2FeCl2 + SnCl4 is an example of ________ reaction
  • first order
  • second order
  • third order
  • none of these
If concentration of reactants is increased by ‘x’, then rate constant K becomes ..

  • Chemistry-Chemical Kinetics-1606.png
  • 2)
    Chemistry-Chemical Kinetics-1607.png
  • k + x
  • k
The rate constant is given by equation K = p.z.e-Ea/RT which factor should register a decrease for the reaction to proceed more rapidly ?
  • E
  • T
  • Z
  • P
The time for half life of a certain reaction A → Products, is one hour. When the initial concentration of the reactant A is 2 mol L-1 how much time does it take for its concentration to come from 0.50 to 0.25 mole L-1 if it is a zero order reaction ?
  • 0.25 h
  • 1 h
  • 4 h
  • 0.5 h
The half life period of a first order reaction is 6.93 minutes. The time required for the completion of 99% of chemical reaction will be
  • 230.3 min
  • 23.03 min
  • 46.06 min
  • 460.6 min
Order of reaction is decided by
  • molecularity
  • pressure
  • temperature
  • mechanism of reaction as well as relative concentration of reactions
Which is correct about zero order reaction?
  • Rate of reaction depends on decay constant
  • Rate of reaction is independent of concentration
  • Unit of rate constant is concentration-1
  • Unit of rate constant is concentration-1 time-1
If the volume of the vessel in which the reaction 2NO + O2 → 2NO2 is occurring is diminished to 1/3 rd of its initial volume. The rate of the reaction will be increased by
  • 3 times
  • 9 times
  • 27 times
  • 36 times
0:0:1


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