Home
Class 12
CHEMISTRY
A certain endothermic reaction: Ato Prod...

A certain endothermic reaction: `Ato` Product, `DeltaH=+ve` proceeds ina sequence of three elementary steps with the rate constant `K_(1),K_(2)` and `K_(3)` and each one having energy of activation `E_(1),E_(2)` and `E_(3)` respectively at `25^(@)C`. The observed rate constannt for the reaction is equal to `K_(3)sqrt((K_(1))/(K_(2)))`.
`A_(1),A_(2)` and `A_(3)` are Arrhenius parameters respectively.
If temperature coefficient of the observed reactionis 2,the numerical value of `E_(1)-E_(2)+2E_(3)` is

A

12.73 kcal

B

25.4 kcal

C

38.19 kcal

D

cannot be calculated

Text Solution

Verified by Experts

The correct Answer is:
B
`log((K_(2))/(K_(1)))=(E_(a))/(2.303R)(1/(T_(1))-1/(T_(2))),log(2)=(epsilon_(a))/(2.3.3R)(1/298-1/308)`
`epsilon_(a)=((0.3010xx2.303xx2xx298xx308)/10),epsilon_(a)=12.72KCal=((2epsilon_(3)+epsilon_(1)-epsilon_(2))/2)`
`12.72=((2epsilon_(3)+epsilon_(1)-epsilon_(2))/2)(2epsilon_(3)+epsilon_(1)-epsilon_(2))=12.72xx2=25.4499,(epsilon_(1)-epsilon_(2)+2epsilon_(3))~=25.4` Kcal
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL KINETICS

    AAKASH SERIES|Exercise LEVEL-II(LECTURE SHEET EXERCISE-III MATCH THE FOLLOWING QUESTIONS)|3 Videos

  • CHEMICAL KINETICS

    AAKASH SERIES|Exercise LEVEL-II(LECTURE SHEET EXERCISE-IV INTEGER ANSWER TYPE QUESTIONS)|10 Videos

  • CHEMICAL KINETICS

    AAKASH SERIES|Exercise LEVEL-II(LECTURE SHEET EXERCISE-I SINGLE & ONE OR MORE THAN ONE CORRECT ANSWER)|50 Videos

  • CHEMICAL KINETCS

    AAKASH SERIES|Exercise EXERCISE - 3.2|45 Videos

  • CHEMICAL THERMODYNAMICS

    AAKASH SERIES|Exercise Additional Practice Exercise|54 Videos

Similar Questions

Explore conceptually related problems

A certain endothermic reaction: Ato Product, DeltaH=+ve proceeds ina sequence of three elementary steps with the rate constant K_(1),K_(2) and K_(3) and each one having energy of activation E_(1),E_(2) and E_(3) respectively at 25^(@)C . The observed rate constannt for the reaction is equal to K_(3)sqrt((K_(1))/(K_(2))) . A_(1),A_(2) and A_(3) are Arrhenius parameters respectively. The observed energy of activation for the reaction is

A certain endothermic reaction: Ato Product, DeltaH=+ve proceeds ina sequence of three elementary steps with the rate constant K_(1),K_(2) and K_(3) and each one having energy of activation E_(1),E_(2) and E_(3) respectively at 25^(@)C . The observed rate constannt for the reaction is equal to K_(3)sqrt((K_(1))/(K_(2))) . A_(1),A_(2) and A_(3) are Arrhenius parameters respectively. The observed Arrhebius parameter for the reaction is

A certain endothermic reaction: Ato Product, DeltaH=+ve proceeds ina sequence of three elementary steps with the rate constant K_(1),K_(2) and K_(3) and each one having energy of activation E_(1),E_(2) and E_(3) respectively at 25^(@)C . The observed rate constannt for the reaction is equal to K_(3)sqrt((K_(1))/(K_(2))) . A_(1),A_(2) and A_(3) are Arrhenius parameters respectively. Which represents the correct value if catalyst is not present:

A certain endothermic reaction: Ato Product, DeltaH=+ve proceeds ina sequence of three elementary steps with the rate constant K_(1),K_(2) and K_(3) and each one having energy of activation E_(1),E_(2) and E_(3) respectively at 25^(@)C . The observed rate constannt for the reaction is equal to K_(3)sqrt((K_(1))/(K_(2))) . A_(1),A_(2) and A_(3) are Arrhenius parameters respectively. Presence of a catalyst decreasesthe energy of activation of each path by half the value of E_(1) . Assuming the other factors same, the observed energy of activation would be

A certain endothermic reaction: Ato Product, DeltaH=+ve proceeds ina sequence of three elementary steps with the rate constant K_(1),K_(2) and K_(3) and each one having energy of activation E_(1),E_(2) and E_(3) respectively at 25^(@)C . The observed rate constannt for the reaction is equal to K_(3)sqrt((K_(1))/(K_(2))) . A_(1),A_(2) and A_(3) are Arrhenius parameters respectively. For a reversible Aunderset(K_(2))overset(K_(1))(hArr)B,DeltaH=q if pre exponential factors are same. The correct relation is

What is the ratio of the rate constants K_(1) and K_(2) ?

The rate constant K_(1) and K_(2) for two different reactions are are 10^(16)e^(-2000//T) and 10^(15)e^(-1000//T) , respectively. The temperature at which K_(1)=K_(2) is

The rate constants of a reaction at 300K and 280 K respectively are K_(1) and K_(2) . Then