Chemistry For Class IX (New Book ) - Chapter No. 4 - Chemical Bonding - Multiple Choice Questions And Fill In The Blanks

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Chapter No.4 - Chemical Bonding
MCQs And Fill In The Blanks
Text Book Exercise

SECTION- A: MULTIPLE CHOICE QUESTIONS
Tick Mark (✓) the correct answer

1. An example of ionic compound is:
(a)H₂
(b)CH₄
(c) N₂
(d)NaCl ✓

2. Interaction between highly electron deficient hydrogen and highly electronegative atom is called:
(a) covalent bond
(b) ionic bond
(c) hydrogen bond ✓
(d) metallic bond

3. Two fluorine atoms share one electron each in their outermost shell to achieve electronic configuration of:
(a) Xe
(b) Ar
(c) Kr
(d) Ne ✓

4. Number of electrons lost by atoms of group IIIA equals:
(a) 1
(b) 2
(c) 3 ✓
(d) 4

5. Atom which loses two electrons from its outer shell to form ion is called:
(a) oxygen
(b) potassium
(c) magnesium ✓
(d) carbon

6. In NaCl crystal lattice each Na⁺ ion is surrounded by:
(a) 6 Cl^- ions ✓
(b) 6 Na⁺ ions
(c) 8 Cl^- ions
(d) 12 Cl^- ions

7. At room temperature most of ionic compounds are:
(a) amorphous solids
(b) crystalline solids ✓
(c) liquids
(d) gases

8. Tendency of atoms to acquire eight electrons in their valence shell is:
(a) octet rule ✓
(b) duplet rule
(c) triplet rule
(d) none of above

9. When one atom forms cation by losing electron and other forms anion by accepting that electron then bond form between them is:
(a) Covalent bond
(b) Ionic bond ✓
(c) coordinate covalent bond
(d) hydrogen bond

10. Noble gases are stable because they contain:
(a) 4 electrons in valence shell
(b) 6 electrons in valence shell
(c) 8 electrons in valence shell ✓
(d) 10 electrons in valence shell

11. Bond which involve 3 shared electron pairs is a:
(a) double covalent bond
(b) single covalent bond
(b) triple covalent bond ✓
(d) none of above

12. A non-metal atom form anion by:
(a) loses of electrons
(b) gain of electrons ✓
(c) loses of protons
(d) gain of protons

13. When two identical atoms share electron pairs and exert force on each other than bond form is:
(a) non-polar covalent bond ✓
(b) polar covalent bond
(c) double covalent bond
(d) coordinate covalent bond

14. Synthetic resins are used on places where:
(a) electric resistance is required
(b) water resistance is required ✓
(c) adhesion is required
(d) friction is required

15. Oxygen belongs to group VIA so number of electrons in its valence shell are:
(a) 3
(b) 4
(c) 5
(d) 6 ✓

16. Electron pairs which are not shared by atoms are called:
(a) electron pairs
(b) lone pairs ✓
(c) bond pairs
(d) shared pairs

17. Strength of intermolecular forces from ionic to covalent bond is:
(a) Weaker ✓
(b) stronger
(c) equal
(d) none of above

18. Ionic crystals have:
(a) high melting points✓
(b) moderate melting points
(c) low melting points
(d) none of above

19. Bond formed by mutual sharing of electron is:
(a) ionic bond
(b) coordinate covalent bond
(c) covalent bond ✓
(d) metallic bond

20. Which of the following diagram shows atoms are bonded with same electronegativity?
(a) A -----:----- B ✓
(b) A ----------: B
(c) A :---------- B
(d) A --:-------- B

21. The attractive force which binds atoms together is called:
(a) a chemical bond
(b) chemical forces
(c) Both 'a' & 'b' ✓
(d) None of above

22. Helium, neon, argon, xenon and krypton present in the atmosphere consist of:
(a) un-bounded atoms ✓
(b) bounded atoms
(c) ionic bonds
(d) covalent bonds

23. Electronic configuration of noble gases is:
(a) ns² np⁴
(b) ns² np⁵
(c) ns² np⁶ ✓
(d) ns² np⁸

24. Which one is not a noble gas?
(a) Helium
(b) Argon
(c) Radon
(d) Oxygen ✓

25. Noble gases are sometimes called the:
(a) slow gases
(b) inactive gases
(c) inert gases ✓
(d) idle gases

26. The outermost shell of the noble gases is:
(a) completely filled ✓
(b) half-filled
(c) partially filled
(d) None of these

27. All noble gases contain 8 electrons in the valence shell except:
(a) neon
(b) krypton
(c) xenon
(d) helium ✓

28. Because of these electronic configurations of noble gases are:
(a) stable and active
(b) stable and not active ✓
(c) unstable and active
(d) unstable and not active

29. Atoms to acquire two electrons in the valence shell is called:
(a) duplet rule ✓
(b) triplet rule
(c) octet rule
(d) divalent rule

30. In 1916 this chemist proposed the octet rule.
(a) John Dalton
(b) Chadwick
(c) G.N. Lewis ✓
(d) Goldstein

31. It plays an important role in determining the chemical properties of the atom, including its ability to form chemical bonds.
(a) number of protons
(b) number of neutrons
(c) electrons present in the innermost shell
(d) electrons present in the outermost shell ✓

32. These electrons in the outermost shell of an atom are called:
(a) valence electrons
(b) outer electrons
(c) Both 'a' & 'b' ✓
(d) None of them

33. Electronic configuration of an element is 1s², 2s² 2p¹, therefore the valence electrons this element has are:
(a) one
(b) two
(c) three ✓
(d) five

34. The valence electrons which are involved in chemical bonding are termed as:
(a) valence electrons
(b) bonding electrons ✓
(c) reactive electrons
(d) ionic electrons

35. The group number in the periodic table indicates the:
(a) number of valence electrons in an atom ✓
(b) total number of electrons in an atom
(c) number of protons in the nucleus
(d) number of neutrons in the nucleus

36. Sodium contains one electron in its valence shell so it belongs to:
(a) group I ✓
(b) group II
(c) group III
(d) zero group

37. Phosphorus belongs to group VA, so in the valence shell, it contains:
(a) one electron
(b) two electrons
(c) three electrons
(d) five electrons ✓

38. Chemical bonding is the combining of atoms to form:
(a) new elements
(b) new atoms
(c) new substances ✓
(d) All of these

39. An interaction that holds two atoms together is called a:
(a) chemical bond ✓
(b) ionic bond
(c) covalent bond
(d) coordinate bond

40. In the formation of an ionic bond, an atom loses electrons and changes into:
(a) negative ion
(b) positive ion ✓
(c) neutral atom
(d) None of these

41. The atom which gains electron changes into:
(a) negative ion ✓
(b) positive ion
(c) neutral atom
(d) None of these

42. The electrostatic force of attraction that holds the oppositely charged ions together is called:
(a) chemical bond
(b) ionic bond ✓
(c) covalent bond
(d) coordinate bond

43. Electrovalent bond is also known as:
(a) chemical bond
(b) ionic bond ✓
(c) covalent bond
(d) coordinate bond

44. Generally, an ionic bond is formed between the atoms of:
(a) two same metals
(b) two different metals
(c) two same groups
(d) two different groups ✓

45. Sodium chloride, potassium chloride, magnesium fluoride are:
(a) coordinate compounds
(b) covalent compounds
(c) ionic compounds ✓
(d) None of these

46. The electron arrangement of sodium atom is:
(a) 2, 8, 0
(b) 2, 8, 1 ✓
(c) 2, 8, 2
(d) 2, 8, 3

47. The electron arrangement of chlorine atom is:
(a) 2, 8, 1
(b) 2, 8, 3
(c) 2, 8, 5
(d) 2, 8, 7 ✓

48. The formula of magnesium oxide is:
(a) MgO ✓
(b) MgO₂
(c) MgO₃
(d) Mg₂O

49. The ionic bond between magnesium and oxygen is stronger than the ionic bond between sodium and chlorine because of the:
(a) larger size of the atoms
(b) larger size of cation
(c) greater charge density on the ions ✓
(d) None of these

50. A covalent bond between two atoms, is formed by the:
(a) electrostatic force between two ions
(b) mutual sharing of electrons ✓
(c) only one of the atoms contributes both electrons constituting the bond
(d) None of these

51. The bond in MgO is:
(a) electrovalent bond ✓
(b) covalent bond
(c) co-ordinate bond
(d) chemical bond

52. The electrons of atoms that pair up to form a chemical bond are called:
(a) pair electrons
(b) ionic pair electrons
(c) covalent pair electrons
(d) bond pair electrons ✓

53. The formations of H₂, HCl, CH₄ are few examples of this type of bonding.
(a) Electrovalent bond
(b) Single covalent bond ✓
(c) Double covalent bond
(d) Triple covalent bond

54. Oxygen (O₂) and ethene (C₂H₄) are examples of this type of bonding.
(a) Electrovalent bond
(b) Single covalent bond
(c) Double covalent bond ✓
(d) Triple covalent bond

55. It has 6 valence electrons in its outer shell.
(a) carbon
(b) chlorine
(c) sodium
(d) oxygen ✓

56. Nitrogen (N₂) and ethyne (C₂H₂) are examples of this type of bonding.
(a) Electrovalent bond
(b) Single covalent bond
(c) Double covalent bond
(d) Triple covalent bond ✓

57. In its outer shells, each nitrogen atom has:
(a) one electrons
(b) two electrons
(c) three electrons
(d) five electrons ✓

58. The covalent bond formed between identical atoms is called:
(a) non-polar covalent bond ✓
(b) polar covalent bond
(c) coordinate covalent bond
(d) dative covalent bond

59. The bond in a hydrogen molecule is:
(a) non-polar covalent bond ✓
(b) polar covalent bond
(c) coordinate covalent bond
(d) dative covalent bond

60. Non-polar covalent bonds are formed when the electronegativities of the two atoms are:
(a) unequal
(b) equal ✓
(c) zero
(d) larger

61. Bonds in HCl, H₂O, NH₃ are:
(a) non-polar covalent bond
(b) polar covalent bond ✓
(c) coordinate covalent bond
(d) dative covalent bond

62. When the difference between electronegative values of two bonded atoms is more than 1.7, the bond will be purely:
(a) polar covalent
(b) non-polar covalent
(c) ionic or electrovalent ✓
(d) covalent

63. When the difference between electronegative values of two bonded atoms is less than 1.7, the bond will be:
(a) polar covalent
(b) non-polar covalent
(c) ionic or electrovalent
(d) covalent ✓

64. The bond will be pure covalent or nonpolar if the electronegativity difference of bonded atoms is:
(a) zero ✓
(b) 1.7
(c) less than 1.7
(d) more than 1.7

65. The type of bond in which bond pair of electrons is contributed by one atom only, is called a:
(a) coordinate covalent 
(b) dative covalent bond
(c) Both 'a' & 'b' ✓
(d) None of these

66. The reaction between ammonia and hydrogen chloride involves the formation of a / an:
(a) ionic bond
(b) covalent bond
(c) polar covalent bond
(d) dative bond ✓

67. Most ionic compounds form:
(a) liquids
(b) crystals ✓
(c) gases
(d) metals

68. The melting and boiling points of ionic compounds are:
(a) high ✓
(b) low
(c) moderate
(d) None of these

69. Aqueous solutions of ionic compounds are:
(a) non-conductor of electricity
(b) conductor of electricity ✓
(c) sometimes conduct electricity
(d) partial conductor of electricity

70. Ionic compounds usually dissolve in:
(a) covalent solvent
(b) ionic solvent
(c) polar solvent ✓
(d) non-polar solvent

71. Ionic compounds are insoluble in:
(a) covalent solvent
(b) ionic solvent
(c) polar solvent
(d) non-polar solvent ✓

72. Which one of these is polar solvent?
(a) oil
(b) water ✓
(c) petrol
(d) kerosene oil

73. As compared to ionic bond, covalent bonds are generally:
(a) weak ✓
(b) strong
(c) stable
(d) unstable

74. Sugar crystals and diamond are the examples of:
(a) ionic compounds
(b) covalent compounds ✓
(c) polar compounds
(d) non-polar compounds

75. Non-polar covalent compounds are generally:
(a) soluble in water
(b) insoluble in water ✓
(c) sometimes insoluble in water
(d) sometimes soluble in water

76. Polar covalent compounds are soluble in:
(a) oil
(b) water ✓
(c) petrol
(d) kerosene oil

77. They do not conduct electricity in the solid, molten or aqueous solution.
(a) Ionic compounds
(b) polar compounds
(c) non-polar compounds ✓
(d) All of these

78. They are bad conductors of electricity.
(a) covalent compounds ✓
(b) ionic compounds
(c) polar compounds
(d) None of these

79. Which one is a polar covalent compound?
(a) CO₂
(b) CH₄
(c) C₂H₆
(d) HCl ✓

80. Which one is non-polar covalent compound?
(a) H₂SO₄
(b) CO₂ ✓
(c) H₂O
(d) HF

81. It is a common white glue.
(a) Polyurethane
(b) Resin glue
(c) Polyvinyl acetate ✓
(d) Epoxy resins

82. It is used in the construction of vehicles, trucks, boats and aircraft.
(a) Polyurethane
(b) Resin glue
(c) Polyvinyl acetate
(d) Epoxy resins ✓