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Electron gain enthalpy will be positive ...

Electron gain enthalpy will be positive in

A

`O^(-2)` is formed from `O^(-1)`

B

`O^(-1)` is formed from O

C

`S^(-1)` is formed from S

D

`Na^(-)` is formed from Na

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The correct Answer is:
A
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AAKASH INSTITUTE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Assignment (Section -B)
  1. Which among the following elements has the highest value for third ion...

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  2. The screening effect of inner electrons of an atom can cause

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  3. The diagonal similarities are due to similar polarising powers for the...

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  4. Which of the following gradation in the properties is false, as we mov...

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  5. The increasing order of electron affinity values of O,S and Se is

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  6. The element which has highest II^(nd) I.E. ?

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  7. The element which has highest electron affinity ?

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  8. Electronegativity of an element is 1.0 on the Pauling scale. Its value...

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  9. Which of the following element has highest shielding constant ?

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  10. Which one of the following order is correct ?

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  11. Which one of the following oxides has highest acidic character ?

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  12. Electron gain enthalpy will be positive in

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  13. Enthalpy change in the following process is A+ e^(-) to A^(-) Delta H=...

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  14. Uub is the symbol for the element with atomic number-

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  15. An element has electronic configuration [Xe] 4f^(7), 5d^(1),6s^(2). It...

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  16. A sudden large jump between the values of second and third ionisation ...

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  17. An element has 56 nucleons in nucleus and if it is isotonic with ""(30...

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  18. Which of the following processes will release energy equal to ionziati...

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  19. The chemistry of Be is very similar to that of aluminium, because

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  20. The ionisation energy of Li is 500 KJ/mole. The amount of energy requi...

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