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A reaction occurs in three steps . The r...

A reaction occurs in three steps . The rate constants of the first , second and third steps of the reaction are `k_(1), k_(2) and k_(3)` respectively and the overall rate constant of the reaction is `k=k_(1)k_(2)//k_(3)` . If the activation energies of the first , second and third step of the reaction are 30, 44 and `56"kJ.mol"^(-1)` respectively , then the overall activation energy of the reaction `("in kJ.mol")` is -

A

23

B

37

C

18

D

42

Text Solution

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The correct Answer is:
C
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CHHAYA PUBLICATION-CHEMICAL KINETICS-MCQ HOTSPOT (Single Correct Type )
  1. The activation energy of a reaction depends on -

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  2. For a reaction, ArarrB , DeltaH = +xkJ .mol^(-1) and activation ener...

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  3. The activation energy of a reaction is zero . If the rate constant of ...

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  4. The rate of a reaction at 37^(@)C is twice the rate of the reaction at...

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  5. Arrhenius equation: k=Ae^(-E(a)//RT) . Which one of the following sta...

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  6. For every 10 K rise in temperature , the rate of a reaction becomes d...

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  7. At 300K , frequency factor (A) of a first order reaction is 1000 times...

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  8. A reaction occurs in three steps . The rate constants of the first , s...

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  9. At a given initial concentration of reactant , the half-life of a rea...

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  10. For a reaction , the graph obtained by plotting t(1//2) of the reactio...

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  11. The slope and intercept of a logk vs 1/T graph of a first order reacti...

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  12. A reaction , 2Ararr product , follows a zero order kinetics. If the ra...

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  13. Initial concentration of the reactant of a first order reaction with a...

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  14. Half -life of a zero order reaction is 60 min . In an experiment , the...

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  15. A first order reaction takes 46 min for its 99% completion . How much ...

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  16. If reversible reaction is exothermic in the forward direction , then -

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  17. An endothermic reaction have an activation energy of E(a)kJ.mol^(-1) ...

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  18. In the reaction , A(g)rarr2B(g)+(1)/(2) C(g) , rate of formation of C ...

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  19. In the reaction, A+3Brarr2C,(d[C])/(dt)=2xx10^(-4)"mol.L"^(-1).s^(...

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  20. A reaction , Xrarr products , is first order. If takes 40min for its c...

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