Covalent bonding electronegativity Fajan's rule and dipole moment - One Line Questions

1. What is the approximate electronegativity value of Hydrogen on the Pauling scale? — 2.1
2. What is the typical electronegativity of Oxygen on the Pauling scale? — 3.5
3. The dipole moment of HCl is 1.03 D. If the bond length is 1.27 Å, what is the percentage of ionic character in HCl? — 17%
4. According to Fajan's rules, increased covalent character in an ionic compound is favored by: — A small cation and a large anion
5. The percentage ionic character of a bond can be estimated from the ratio of its observed dipole moment to the theoretical dipole moment of: — A bond with 100% ionic character
6. Fajan's rules suggest that covalent character is enhanced when the cation has: — A high charge density
7. A zero dipole moment indicates that a molecule is: — Always non-polar
8. The sum of dipole moments of individual polar bonds in a molecule gives the: — Net dipole moment of the molecule
9. The dipole moment of a molecule is a measure of its: — Polarity
10. Which bond has the most polar character? — F-H
11. Which of the following elements is the most electronegative? — Fluorine
12. Which of the following compounds has the highest dipole moment? — CH3Cl
13. Which of the following molecules is polar? — H2O
14. Which of the following is the correct trend for dipole moment in the given hydrides? — H2O > H2S > H2Se
15. Which of the following is NOT a factor influencing electronegativity according to Fajan's rules? — Number of valence electrons
16. Which element has an electronegativity value of approximately 4.0 on the Pauling scale? — Fluorine
17. Which of the following is the most polar molecule? — CO
18. Electronegativity is a measure of the ability of an atom to: — Attract electrons in a covalent bond
19. Fajan's rules are based on the concept of: — Polarization of the anion by the cation
20. Which of the following factors does NOT influence the dipole moment of a molecule? — Bond length only
21. Which factor increases the polarity of a covalent bond? — Large difference in electronegativity between bonded atoms
22. Which of the following pairs has the most polar covalent bond? — H-F
23. In the series H2O, H2S, H2Se, H2Te, the dipole moment decreases in the order: — H2O > H2S > H2Se > H2Te
24. Fajan's rules state that a smaller cation with a higher positive charge will: — Induce more polarization in the anion
25. Fajan's rule states that the polarization of an anion increases with: — Increasing size of the anion and increasing charge on the cation
26. Which of the following is NOT a consequence of dipole moment? — Molecular shape determination
27. The electronegativity of Carbon is approximately 2.55. The bond between Carbon and Hydrogen (electronegativity 2.20) is: — Slightly polar covalent
28. Fajan's rule implies that the bond between a large cation and a large anion is more likely to be: — Covalent
29. Fajan's rules primarily apply to ionic compounds to predict the extent of: — Covalent character
30. Which of the following statements about electronegativity is FALSE? — Noble gases have high electronegativity values.
31. A molecule with polar bonds can be nonpolar if: — It has a symmetrical shape and the bond dipoles cancel out
32. According to Fajan's rules, what characteristic of a cation favors greater covalent character in an ionic bond? — Small size and high charge
33. Consider the series LiCl, NaCl, KCl, CsCl. The covalent character increases in the order: — LiCl < NaCl < KCl < CsCl
34. The most electronegative element in the second period is: — Fluorine
35. According to Fajan's rules, a cation with a d10 electron configuration will have: — High polarizing power
36. Fajan's rules primarily explain the degree of covalent character in which type of bond? — Ionic bond
37. Which of the following compounds exhibits the highest ionic character? — LiCl
38. In which of the following compounds does the cation have the highest polarizing power? — AlCl3
39. Which of the following has the highest covalent character? — NaI
40. What is the correct order of increasing electronegativity? — H < C < N < O
41. The 'dipole moment' is a vector quantity. Its direction is from: — Atom with lower electronegativity to higher electronegativity
42. A bond formed between two atoms with a large difference in electronegativity is likely to be: — Ionic
43. The electronegativity difference between two atoms A and B is 1.7. The bond between A and B is considered: — Polar covalent
44. According to Fajan's rules, what characteristic of an anion favors greater covalent character? — Large size and low charge
45. Which molecule has polar bonds but a zero dipole moment? — CCl4
46. Which of the following elements has the lowest electronegativity? — Cesium
47. The dipole moment of NH3 is greater than that of NF3, even though Fluorine is more electronegative than Hydrogen. This is because: — The bond dipoles in NH3 align with the lone pair dipole, while in NF3 they oppose it.
48. The dipole moment of CO is approximately 0.12 D, while that of NO is approximately 0.16 D. This difference is primarily due to: — The difference in electronegativity between C and O versus N and O
49. In the molecule BF3, the B-F bonds are polar, but the molecule itself is nonpolar. This is due to: — The symmetrical trigonal planar geometry
50. The unit of dipole moment is typically expressed in: — Debye
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