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The enthalpies of two reactions are Delt...

The enthalpies of two reactions are `DeltaH_(1)`and `DeltaH_(2)` both positive with `DeltaH_(2)gt DeltaH_(1)`. If the temperature of reacting system is increased from `T_(1)` to `T_(2)` predict which of the following alternative is correct ?

A

`(k_(1))/(k_(1'))=(k_(2))/(k_(2'))`

B

`(k_(1))/(k_(1'))gt(k_(2))/(k_(2'))`

C

`(k_(1))/(k_(2'))lt(k_(2))/(k_(1'))`

D

`(k_(1))/(k_(1'))lt(k_(2))/(k_(2'))`

Text Solution

Verified by Experts

The correct Answer is:
D
As the temperature of reacting system is increased the equilibrium constant of reaction is also increased for endothermic reactions so for two reactions on increasing the temperature by equal amounts .
`(k_(1))/(k_(1))lt(k_(2))/(k_(2))`
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Knowledge Check

  • The activation energies for the two reactions are Ea and Ea^(') with E_(a)gtE_(a)^(') . If the temperature of the reaction system is increased from T_(1) to T_(2) . Predict which alternative is correct. (k^(')) are the rate constants at highest temperature.

    A
    `(k_(1)^('))/(k+(1)) = (k_(2)^('))/(k_(2))`
    B
    `k_(1) lt k_(2)` and `k_(2)^(') lt k_(1)^(')`
    C
    `k_(1) lt k_(2)`
    D
    `(k_(1)^(')/k_(1)) lt (2k_(2)^('))/(k_(2))`

  • The activation energies of two reactions are E_(1) & E_(2) with E_(1)gtE_(2) . If temperature of reacting system is increased from T_(1) (rate constant are k_(1) and k_(2) ) to T_(2) (rate constant are k_(1)^(1) and k_(2)^(1) ) predict which of the following alternative is incorrect.

    A
    `(k_(1)^(1))/(k_(1))=(k_(2)^(1))/(k_(2))`
    B
    `(k_(1)^(1))/(k_(1))gt(k_(2)^(1))/(k_(2))`
    C
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    D
    `k_(1)^(1)ltk_(2)^(1)`

  • The equation DeltaH=DeltaH_(1)+DeltaH_(2)DeltaH_(3)

    A
    Kirchoff s equation
    B
    vant't Hoff isotherm
    C
    van 't Hoff isochore
    D
    Hess's law

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