The correct order for electron affinity of halogens is :

1. Br > F

2. F > Cl

3. Br > Cl

4. F > I

Subtopic:  Electron Affinity (EA) |
 71%
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Element/Ion that has the highest electron affinity is : 

1. F- 2. O-
3. O 4. Na
Subtopic:  Electron Affinity (EA) |
From NCERT
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Values of electronegativity like 3.0, 2.8, 2.5 are related to :-

(1) Elements having low IP in the periodic table

(2) Elements having high EA in the periodic table

(3) Chalcogens

(4) None of the above

Subtopic:  Electron Affinity (EA) |
 57%
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The pair of which addition of 2nd electron in both the atoms are endothermic :-

(1) N, Ne

(2) Be, F

(3) B, C

(4) All of the above

Subtopic:  Electron Affinity (EA) |
 71%
From NCERT
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The incorrect match among the following is:

1. B < C < N < O (increasing first ionisation enthalpy)

2. I < Br < F < Cl (increasing electron gain enthalpy)

3. Li < Na < K < Rb (increasing metallic radius)

4. Al3+ < Mg2+ < Na+ <F- (increasing ionic size)

Subtopic:  Electron Affinity (EA) |
 76%
From NCERT
NEET - 2016
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Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

1. Cl> Br> F> I2

2. Br> I> F> Cl2

3. F> Cl> Br> I2

4. I> Br> Cl> F2

Subtopic:  Electron Affinity (EA) |
 54%
NEET - 2016
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The formation of the oxide ion O2-(g), from oxygen atom requires first an exothermic and

then an endothermic step as shown below,

O(g) + e-           O-(g); fH° = -141kJmol-1
O-(g) +e-           O2-(g); fH° = +780 kJ mol-1

Thus, process of formation of O2- in gas phase is unfavourable even though O2- is

isoelectronic with neon. It is due to the fact that

1. electron repulsion outweighs the stability gained by achieving noble gas configuration

2. O- ion has comparatively smaller size than oxygen atom

3. Oxygen is more electronegative

4. addition of electron in oxygen result in large size of the ion

Subtopic:  Electron Affinity (EA) |
 70%
NEET - 2015
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The correct order of increasing electron gain enthalpy with a negative sign for the elements O, S, F, and Cl is : 

1. Cl < F < S < O                   

2. O < S < F < Cl

3. F < S < O < Cl                   

4. S < O < Cl < F

Subtopic:  Electron Affinity (EA) |
From NCERT
NEET - 2010
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Which of the following transformation least energy is required?

(1) F-g  Fg +e-                 

(2) P-gPg+e-

(3) S-gSg+e-                   

(4) Cl-gClg+e-

Subtopic:  Electron Affinity (EA) |
 59%
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Which of the following represents correct order of electron affinity?

(1) Cl>F>S>O                           

(2) F>O>S>Cl

(3) F>Cl>S>O                           

(4) Cl>S>O>F

Subtopic:  Electron Affinity (EA) |
 81%
From NCERT
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