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O(g) +2e^(-1) rarr O^(-2) (g) -E = +744....

`O(g) +2e^(-1) rarr O^(-2) (g) -E = +744.7` The reaction for the positive value of `e` is

A

enothermic reaction

B

exothermic reaction

C

both 1 and 2

D

All of the above are wrong

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The correct Answer is:
A
When electron is brought near `O^(-1)` there will be repulsion between them, and therefore the energy will be positive i.e. there will be absorption of elergy during the process.
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BANSAL-PERIODIC TABLE-EXERCISE-3
  1. O(g) +2e^(-1) rarr O^(-2) (g) -E = +744.7 The reaction for the positiv...

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  2. Use the following system of naming elements in which first alphabets o...

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  3. Mg^(2+), O^(2-),Na^(+),F^(-),N^(3-) (Arrange in decreasing order of io...

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  4. Why Ca^(2+) has a smaller ionic radius than K^(+).

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  5. Arrange in decreasing order of atomic size: Na,Cs, Mg, Si, CI

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  6. Why the first ionisation energy of carbon atom is greater than that of...

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  7. The IE do not follow a regular trend in II & III periods with increasi...

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  8. Explain why a few elements such as Be(+0.6),N(+0.3) & He(+0.6) have po...

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  9. Which bond in each pair is more polar (a) P-CI or P - Br (b) S -CI o...

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  10. From among the elements,choose the following: CI,Br, F,Al, C,Li,Cs& Xe...

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  11. In the ionic ompound KF, the K^(+) and F^(-) ions are found to have pa...

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  12. Which oxide is more basic, MgO or BaO? Whay?

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  13. The basic nature of hydroxides of group 13 (III-A) decreases progressi...

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  14. Based on location in P.T. which of the following would you expect to b...

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  15. Compare the following giving reasons Acidic nature of oxides: CaO, CO,...

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  16. The ionisation potentials of atoms A and B are 400 and 300 kcal mol^(-...

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  17. If internuclear distance between CI atoms in CI(2) is 10Å & between H ...

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  18. The As-CI bond distance in AsCI(3) is 2.20 Å. Estimate the SBCR (singl...

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  19. The Pt-CI distance is 2.32 A in several crystaline compounds What is...

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  20. The IE values of Al((g)) = Al^(+) +e is 577.5 kJ mol^(-) and DeltaH fo...

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  21. For the gaseous reaction K+F rarrK^(o+)+F^(ɵ) Delta H = 19 kcal mo...

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