9th Class Chemistry Chapter no.4 MCQs
Unit no.4 MCQs of 9th Class Chemistry
Structure of Molecules:
1. An atom having six electrons in its valence shell with achieve noble gas electron configuration by:
a. Gaining two electrons
b. Gaining one electron
c. Losing two electrons
d. Losing all electrons
2. Considering the electronic configuration of atoms which atom with the given atomic number will be most stable one?
a. Ten
b. Six
c. Twelve
d. Eight
3. Octet rule is:
a. Pattern of electronic configuration
b. Description of eight electrons
c. Attaining of eight electrons
d. Picture of electronic configuration
4. Transfer of electrons between atoms results in:
a. covalent bonding
b. metallic bonding
c. coordinate covalent bonding
d. ionic bonding
5. An atom can accommodate 8 electrons in its valence shell by …… methods:
a. 4
b. 2
c. 5
d. 3
6. Duplet rule is:
a. Pattern of electronic configuration
b. Description of two electrons
c. Attaining of two electrons
d. Picture of electronic configuration
7. Noble gases have …… electron in their valence shell:
a. 6
b. 2
c. 8
d. 4
8. Noble gases are called:
a. Non reactive
b. Highly reactive
c. None
d. Least reactive
9. In elements of group 1, the number of electrons in valence shell are:
a. 3
b. 1
c. 4
d. 2
10. In elements of group 2, the number of electrons in valence shell are:
a. 3
b. 1
c. 2
d. 4
11. In elements of group 17, the number of electrons in valence shell are:
a. 9
b. 5
c. 17
d. 7
12. Atoms react with each other because:
a. They want to attain stability
b. They are attracted to each other
c. They want to disperse
d. They are short of electrons
13. The force of attraction between atoms that holds them together in a substance is called:
a. Electric force
b. Chemical bond
c. Chemistry
d. Gravitational force
14. In octet rule, atoms attain the electronic configuration of:
a. Halogens
b. Alkali metals
c. Noble gases
d. Alkaline earth metals
15. A noble gas is:
a. Neon
b. Helium
c. Argon
d. All
16. The bond formation between ions is due to:
a. Chemical force
b. Electrostatic force
c. Frictional force
d. Gravitational force
17. When a molecule is formed, the energy of the system is:
a. Remains constant
b. Lowers
c. None
d. Becomes dominant
18. When an electronegative element combines with an electropositive element the type of bonding is:
a. Polar covalent
b. Covalent
c. Coordinate covalent
d. Ionic
19. A bond formed between two non-metals is expected to be:
a. Coordinate covalent
b. Covalent
c. Metallic
d. Ionic
20. A bond pair in covalent molecules usually has:
a. Three electrons
b. One electron
c. Four electrons
d. Two electrons
21. Which of the following compounds is not directional in its bonding?
a. CO2
b. CH4
c. H2O
d. KBr
22. Identify which pair has polar covalent bonds.
a. C2 H2 ??? H2 O
b. Cl2 ??? O2
c. HCl ??? H2 O
d. N2 ??? H2 O
23. Covalent bond involves the:
a. Sharing of electrons
b. Donation of electrons
c. Repulsion of electrons
d. Acceptance of electrons
24. How many covalent bonds does molecule C H have?
a. Four
b. Two
c. Five
d. Three
25. How many electrons does a triple covalent bond involve?
a. Four
b. Eight
c. Only three
d. Six
26. Which pair of the molecules has same type of covalent bonds?
a. C2H4 and O2
b. HCl and O2
c. C2H2 and O2
d. N2 and O2
27. The chemical bond formed by mutual sharing of electrons between atoms is called:
a. Covalent bond
b. Ionic bond
c. Co ordinate covalent bond
d. Metallic bond
28. If the covalent bond is formed between two same kind of elements then bond will be:
a. Metallic bond
b. Polar covalent bond
c. Dative covalent bond
d. Non polar covalent bond
29. Which one of the following is an ionic compound?
a. NaCl
b. HCL
c. BF3
d. CH4
30. Reason to form ammonium ion is:
a. Metallic bond
b. Covalent bond
c. Co ordinate covalent bond
d. Ionic bond
31. Covalent bond in methane is called:
a. Triple
b. Single
c. Dative
d. Double
32. The bond present in H-F molecule is called:
a. Polar covalent
b. Ionic
c. Co ordinat
d. Non polar
33. Ionic character predominantly appears in any bond if:
a. The difference of electronegativity is equal to 1.7
b. The difference of electronegativity is greater than 1.7
c. The difference of electronegativity is zero
d. The difference of electronegativity is less than 1.7
34. The result of transfer of electron appear to:
a. Covalent bond
b. Metallic bond
c. Co ordinate covalent bond
d. Ionic bond
35. Molecule having triple covalent bond is:
a. N2
b. H2
c. C2H4
d. O2
36. Covalent bond is a result of:
a. Sharing of electrons
b. Donating of electrons
c. Repulsive forces between electrons
d. Gaining of electrons
37. The bond formed by complete transfer of electrons between atoms is called:
a. Metallic bond
b. Ionic bond
c. Co ordinate covalent bond
d. Covalent bond
38. Which molecule has polar covalent bond?
a. HCL
b. H2
c. N2
d. Cl2
39. The number of electrons in the valence shell of chlorine is:
a. 5
b. 6
c. 4
d. 7
40. The bond formed between two same kind of atoms is called:
a. Coordinate covalent bond
b. Ionic bond
c. Metallic bond
d. Covalent bond
41. The types of chemical bonds are:
a. 4
b. 2
c. 5
d. 3
42. The elements of groups 1 and 2 are:
a. Partial positive
b. Electropositive
c. Partial negative
d. Electronegative
43. Halogens are:
a. Partial positive
b. Electropositive
c. Partial negative
d. Electronegative
44. Halogens have the tendency to ……… the electrons:
a. Neither lose nor gain
b. Lose
c. None
d. Gain
45. The chemical bond in NaCl is:
a. Coordinate covalent bond
b. Ionic bond
c. Metallic bond
d. Covalent bond
46. The number of electrons in the valence shell of sodium is:
a. 7
b. 1
c. 5
d. 2
47. The compounds formed by ionic bond between their atoms are called:
a. Polar compounds
b. Ionic compounds
c. Non polar compounds
d. Covalent compounds
48. The valence shell electronic configuration of chlorine is:
a. 3s2 3p7
b. 3s2 3p3
c. 3s2 3p6
d. 3s2 3p5
49. The types of covalent bond are:
a. Four
b. Two
c. Five
d. Three
50. Covalent bond between two atoms is represented by:
a. A triangle
b. A bar
c. A dot
d. A circle
52. How many electrons are involved in a double covalent bond?
a. 4
b. 2
c. 6
d. 3
53. The type of bond in is:
a. Coordinate covalent bond
b. Ionic bond
c. Metallic bond
d. Covalent bond
54. The type of bond in is:
a. Triple covalent bond
b. Single covalent bond
c. Ionic bond
d. Double covalent bond
55. In coordinate covalent bond, the atom which lose electron is called:
a. Acceptor
b. Donor
c. Both
d. None
56. In coordinate covalent bond, the atom which gain electron is called:
a. Acceptor
b. Donor
c. Both
d. None
57. Which one of the following is an electron deficient molecule?
a. N2
b. NH3
c. O2
d. BF3
58. Which one of the following is the weakest force among the atoms?
a. Intermolecular force
b. Ionic force
c. Covalent force
d. Metallic force
59. Ice float on water because:
a. Water is denser than ice
b. Ice is denser than water
c. None of these
d. Ice is crystalline in nature
60. Which of the following compound does not dissolve in water?
a. KBr
b. C6H6
c. MgCl2
d. NaCl
61. Boiling point of sodium chloride is:
a. 100°C
b. 800°C
c. 0°C
d. 1413°C
62. Boiling point of water is:
a. 101°C
b. 99°C
c. 102°C
d. 100°C
63. Melting point of sodium chloride is:
a. 802°C
b. 800°C
c. 803°C
d. 801°C
64. During the formation of chemical bond, which forces
become dominant?
a. Wander walls forces
b. Repulsive forces
c. Hydrogen bonding
d. Attractive forces
65. In hydrogen bonding:
a. Covalent forces
b. Inter-molecular forces
c. Metallic forces
d. ionic forces
66. Hydrogen bonding is represented by
a. Double Lines
b. Dotted Lines
c. Triple Lines
d. Single Lines
67. Melting point of sodium is:
a. 97°C
b. 100°C
c. 650°C
d. 496°C
68. Methane is an example of:
a. Triple covalent bond
b. Single covalent bond
c. Dative covalent bond
d. Double covalent bond
69. Density of water is:
a. 1gcm-3
b. 2gcm-3
c. -1gcm-3
d. -2gcm-3
70. The energy required to break the inter molecular forces
in one mole liquid is:
a. 19KJ
b. 17KJ
c. 20KJ
d. 18KJ
71. The energy required to break the chemical bond between hydrogen and chlorine atoms in 1 mole of HCl:
a. 330kJ
b. 420kJ
c. 230kJ
d. 430kJ
72. The van der Waals forces are ……… in nature:
a. Chemical
b. Mechanical
c. Magnetic
d. Electrical
73. Hydrogen bonding is present in ……… molecules:
a. Polar
b. Ionic
c. Non polar
d. Covalent
74. The boiling point of water is greater than alcohol due to:
a. Hydrogen bonding
b. Van der waals forces
c. Electrical forces
d. Dipole dipole forces
75. The boiling point of alcohol is:
a. 56°C
b. 100°C
c. 78°C
d. 146°C
76. Identify the compound which is not soluble in water
a. KBr
b. C6H6
c. Mgcl2
d. NaCl
77. If the difference of electro negativity between two elements is more than 1.7 then the bond between will be:
a. Co ordinate
b. Ionic
c. Metallic
d. Covalent
78. If the difference of electro negativity between two elements is less than 1.7 then the bond between will be:
a. Non polar
b. Covalent
c. Ionic
d. None
79. What concentration of salts is required to remove unwanted bacteria?
a. 15%
b. 5%
c. 20%
d. 10%
80. Metals are good conductors of electricity due to:
a. Hardness
b. Mobile electrons
c. Mobile protons
d. Metallic cations
81. Which of the following molecule is not triatomic?
a. H2O
b. H2
c. Co2
d. O3
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