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Which one of the following arrangements ...

Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?

A

`Cl lt F lt S lt O`

B

`O lt S lt F lt Cl`

C

`S lt O lt Cl lt F`

D

`F lt Cl lt O lt S`

Text Solution

Verified by Experts

The correct Answer is:
B
Halogens have very high electron affinity. It may be rated that the electron affinity of fluorine is unexpectedly low `(lt Cl)`. This may perhaps be due to small size of F atom. The value of electron gain enthalpies for Cl, F, S and O are respectively 349, 333, 200 and 142 kJ/mol, hence correct order is `ClgtFgtSgtO`.
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The correct order of electron gain enthalpy is

The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity of first electron affinity or electron gain enthalpy. The first electron affinity is given a negative sign as the addition of an electron to a neutral atom is an exoergic process. The addition of electron to A^(-) requires energy to overcome the force of repulsion. Thus, the second electron affinity is an endoergic process. The magnitude of electron affinity depends on a number of factors such as (i) atomic size (ii) effective nuclear charge (iii) screening effects (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increase as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configuration. In a group, electron affinity decreases as the size increases. However, the members of 3rd period have somewhat higher values than the members in the 2nd period of the same subgroups. Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative spin) of the given atomic species?

ERRORLESS -CLASSIFICATION OF ELEMENTS AND PERIODIC PROPERTIES -Ordinary Thinking Objective Questions Electron affinity
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  2. Which one of the following ionic species has the greatest proton affin...

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  3. Which one of the following arrangements represents the correct order o...

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  4. The amount of energy which is released due to addition of ectra electr...

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  5. The electron affinity of

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  6. Fluorine has lower electron affinity than chlorine because of

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  7. Order of electron affinity of F,Cl,Br and I is

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  8. Which of the following has the least electron affinity in kJ mol^(-1)?

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  9. Which of the following species has the highest electron affinity?

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  10. Which of the following properties show gradual decrease with increase ...

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  11. The electronic configuration of the element with maximum electron affi...

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  12. Match the entries listed in column I with appropriate properties liste...

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  13. The element with positive electron gain enthalpy is

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  14. The electron affinity values (in kJ mol^(-1) ) of three halogens, X, Y...

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  15. Which one of the following is an incorrect statement?

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  16. Electron affinity depends on

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  17. The electron affinity for the inert gases is

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  18. The correct order of electron affinity of B, C, N, O is

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  19. the amount of energy released when 10^(6) atoms of iodine in vapour st...

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  20. The electron affinity of Be is almost similar to that of

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