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Rate constant of a reaction can be expre...

Rate constant of a reaction can be expressed by Arrhenius equation as `K=Ae(-E//R)`. In this equation, E represents

A

The energy above which not all the colliding molecules will react

B

The energy below which colliding molecules will not reacts

C

The total energy of the reacting molecules at temperature T

D

The function of molecules which energy greater than the activation energy of the reaction

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The correct Answer is:
B
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Arrhenius studied the effect of temperature on the rate of a reaction and postulated that rate constant varies with temperature exponentially as k=Ae^(-E_(a)//RT) . For most of the reactions it was found that the temperature coefficient of the reaction lies between 2 to 3. The method is generally used for finding the activation energy of a reaction. Keeping temperature constant, the effect of catalyst on the activation energy has also been studied by studying how much the rate of reaction changes in the presence of catalyst. In most of the cases, it is observed that catalyst lowers the activationenergy barrier and increases the rate of reaction. The pre-exponential factor in the Arrhenius equation of a second order reaction has the units

Write the Arrhenius equation for the rate constant (k) of a reaction.

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The instantaneous rate of an elementary chamical reactkon aA+bBhArr cC+dD can be given by rate =K_(f)[A]^(a)[B]^(b)-K_(b)[C]^(c)[D]^(d) where K_(f) and K_(b) are rate constants for forward and backward reactions respectively for the reversible reaction. If the reaction is an irreversible one, the rate is expressed as, rate =K[A]^(a)[B]^(b) where K is rate contant for the given irreversible rate of disappearance of A is a/b times the rate of disappearance of B. The variation of rate constant K with temperature is expressed in terms of Arrhenius equation: K=Ae^(-E_(a)//RT) whereas the ratio (K_(f))/(K_(b)) is expressed in terms of van't Hoff isochore: (K_(f))/(K_(b))=Ae^(-DeltaH//RT) , where E_(a) and DeltaH are energy of activation and heat of reaction respectively. For a gaseous phase -I order reaction A(g)toB(g)+2C(g) (rate constant K=10^(-2)"time"^(-1) ) in a closed vesel of 2 litre containing 5 mole of A(g) at 27^(@)C which of the following is correct?

AAKASH SERIES-CHEMICAL KINETICS-Objective Exercise - 1
  1. Which of the following does not affect the rate of reaction?

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  2. What is the rate of the reaction for 2AtoB

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  3. Rate constant of a reaction can be expressed by Arrhenius equation as ...

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  4. For N(2)O(5) (In "CC"l(4))to2NO(2)+1/2O(2),K=6xx10^(-4)s^(-1) at 350 K...

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  5. For a reaction(1)/(2)A to 2B rate of disappearance of A is related to ...

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  6. SO(2) reacts with O(2) as follows 2SO(2) +O(2)to2SO(3), the rate of di...

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  7. The minimum energy required for molecules to enter into chemical react...

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  8. For a reversible reaction, A hArr B, which one of the following statem...

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  9. In a reaction, threshold energy is equal to

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  10. The value of activation energy for a chemical reaction primarily depen...

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  11. Wrong statement among the following is

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  12. The rate of a reaction triples when temperature changes from 20^(@)C t...

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  13. The temperature dependence on rate constant (k) of a chemical reaction...

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  14. For the reaction A+BhArrC+D, the forward reaction is exothermic. The a...

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  15. Collision theory satisfactorily explains

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  16. According to collision theory of reaction rates, the activation energy...

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  17. Increase in the concentration of the reactants leads to the change in

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  18. The population of activated molecules can be increased by A) increas...

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  19. Consider an endothermic reaction XtoY with the activation energies E(b...

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  20. An endothermic reactio AtoB ha s an activation energy as kKJ"mol"^(-1)...

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