Chemistry_Class-11_Chapter-3_Topic-4_Electron Affinity

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1. The correct order of reactivity of halogens is

(a) F > Cl > Br > I

(b) F Br < I

(d) F < Cl <Br> I

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2. The electronic configuration of the element with maximum electron affinity is

(a) 1S2 , 2S2 , 2P3

(b) 1S2 , 2S2 , 2P5

(d) 1S2 , 2S2 , 2P6 , 3S2 , 3P3

(e) 1S2 , 2S2 , 2P6 , 3S1

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3. Which of the following has the least electron affinity in kJmol-1

(a) Oxygen

(b) Carbon

(d) Boron

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4. Fluorine has low electron affinity than chlorine because of

(a) Smaller radius of fluorine, high density

(b) Smaller radius of chlorine, high density

(d) Smaller radius of chlorine, less density

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5. Which of the following species has the highest electron affinity

(a) F

(b) O

(d) Na+

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6. Which of the following species has the highest electron affinity

(a) F-

(b) O

(d) Na+

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7. Which one of the elements has the maximum electron affinity

(a) F

(b) Cl

(d) I

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

(a) F Br > I

(b) F > Cl > Br > I

(d) F > Cl <Br> I

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9. Which one of the following ionic species has the greatest proton affinity to form stable compound

(a) HS-

(b) NH2-

(d) I-

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10. The electron affinity of Be is similar to

(a) He

(b) B

(d) Na

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11. The element with positive electron gain enthalpy is

(a) Hydrogen

(b) Sodium

(d) Fluorine

(e) Neon

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12. Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O

(a) Al < Ca < O < C < F

(b) Al < O < C < Ca < F

(d) Ca < Al < C < O < F

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13. Arrange S,O and Se in ascending order of electron affinity

(a) O < Se < S

(b) Se < O < S

(d) S < Se < O

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14. The energy evolved is highest for which of the following reactions

(a) F + e- → F-1

(b) Cl + e- → Cl-

(d) O + 2e- → O2-

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

(a) O > C > N > B

(b) B > N > C > O

(d) O > B > C > N

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16. The electron affinities of halogens are F = 322 , Cl = 349 , Br = 324 , I = 295kJmol-1 . The higher value for Cl as compared to that of F is due to

(a) Weaker electron-electron repulsion in Cl

(b) Higher atomic radius of F

(d) More vacant p-subshell in Cl

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17. . The electron affinity values (in kJmol-1) of three halogens X,Y and Z are respectively -349,-333 and -325. Then X, Y and Z are respectively

(a) F2 , Cl2 and Br2

(b) Cl2 , F2 and Br2

(d) Br2 , Cl2 and F2

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18. Which among the following factors is the most important in making fluorine the strongest oxidizing halogen

(a) Hydration enthalpy

(b) lonization enthalpy

(d) Bond dissociation energy

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19. Which of the following pairs show reverse properties on moving along a period from left to right and from top to down in a group

(a) Nuclear charge and electron affinity

(b) Ionisation energy and electron affinity

(d) None of these

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20. Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species

(a) Cl < F < S < O

(b) O < S < F < Cl

(d) F < Cl < O < S

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21. The amount of energy released when 106 atoms of iodine in vapor state are converted to Ions is 4.9 ×10-13J What will be electron affinity of iodine in eV per atom

(a) 2.0

(b) 2.5

(d) 3.06

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22. When the first electron gain enthalpy (∆egH) of oxygen is-141kJ/mol its second electron gain enthalpy is :

(a) Almost the same as that of the first

(b) Negative, but less negative than the first

(d) A positive value

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