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The first IP lithium is 5.41eV and elect...

The first IP lithium is `5.41eV` and electron gain enthalpy of `Cl` is `-3.61eV` . Calculate `Delta H` in `KJ mol^(-1)` for the reaction:
`Li_(g) +Cl_(g) rarr Li_(g)^+ +Cl_(g)^(-)`.

Text Solution

Verified by Experts

The overall reaction is written into two partial equations
`Li(g) to Li ^(+)+ e^(-)" "Delta E_(1)=5.4 eV`
`Cl (g) + e ^(-) to Cl ^(-) " "Delta E _(2) =-3.6 eV`
`Delta H = Delta E_(1)-Delta E_(2) =5.4 -3.6 =1.8 eV`
`=1.8 xx 23.06` k cal `mol ^(-1)`
`=41.508` kcal `mol ^(-1)`
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MOTION-PERIODIC TABLE -Exercise - 4 | Level-II
  1. The first IP lithium is 5.41eV and electron gain enthalpy of Cl is -3....

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  2. Moving from right to left in a periodic table, the atomic size is :

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  3. The increasing order of electronegativity in the following elements :

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  4. One element has atomic weight 39. Its electronic configuration 1s^(2) ...

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  5. Number of paired electrons in O(2) molecule is .

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  6. The decreasing size of K^(+) , Ca^(2+) , Cl^(-) & S^(2-) follows the o...

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  7. Which of the following oxide is neutral ?

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  8. Which of the following has the maximum number of unpaired electrons ?

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  9. The following acids have been arranged in order of decreasing acid str...

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  10. The incorrect statement among the following is : (A)

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  11. Which of the following are amphoteric ?

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  12. Li^(+),Mg^(2+),K^(+),Al^(3+) (Arrange in increasing order of radii)

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  13. Anhydrous AlCl(3) is covalent . From the data given below predict whet...

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  14. Which one of the following statement (s) is (are) correct ? (A) Th...

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  15. Statement-1 : F arom has a less negative electron gain enthalpy than C...

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  16. Al(OH)(3) is amphoteric is nature. Al-O and O-H bonds can be borken ...

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  17. The correct order of radii is

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  18. The correct order of acidic strength is

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  19. The IE(1) of Be is greater than that of B. [T/F]

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  20. The set representing correct order of IP(1) is

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  21. Identify the least stable ion amongst the following:

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