Complete and comprehensive Ninth Class Chemistry Notes.

1. Chapter 5
Chemical Bonding
(The future will take revenge if you spoil the
present)
Chemistry MCQs Dr. Sajid Ali Talpur

2.  Definitions
1. Chemical bond: - The attractive force that
holds atoms together in a compound is called
chemical bond.
2. Ionic or electrovalent bond: - It is defined as
the electrostatic force of attraction between
positive and negative ions.
3. Covalent bond: - Achemical bond that involves
the sharing of electrons is called covalent bond.
4. Single covalent bond (—): -such a bond is
formed when one electron is contributed from
each atom making one shared pair. E.g. Cl2
5. Double covalent bond: -in such a covalent
bond each of the two atoms contribute two
electrons as in O2
6. Triple covalent bond: -in triple covalent bond
each atom contributes three electrons as in N2
7. Co-ordinate or dative covalent bond: -a
covalent bond in witch one of the bonded atoms
furnishes both of the shared electrons.
8. Hydrogen bond: - it is an electrostatic force of
attraction between a partially positive hydrogen
atom of one molecule and the electronegative
atom of the other molecule
Chemistry MCQs Dr. Sajid Ali Talpur

3. 9. Metabolic Bond: - It is defined as the force of
attraction between electrons and the positive
nuclei of atoms.
10. Dispersion Forces: The dispersion forces are
the weak attractive forces between temporarily
polarized atoms (or molecules) caused by the
varying positions of the electrons during their
motion about the nuclei
11. Dipole moment: - the measure of the degree of
the polarity of a polar compound is called dipole
moment.
12. Electronegativity: - It is the power of an atom
to attract shared pair of electrons towards itself.
13. Bond pairs electrons: - also called active set of
electrons they take part in bond formation and
are incorporated as shared pair.
14. Lone pair of electrons: - also called non
bonding pairs, are paired electrons but don’t
take part in bonding.
Chemistry MCQs Dr. Sajid Ali Talpur

4.  Multiple Choice Questions:
1. The force which holds atoms together in a
molecule or crystal is called
a) chemical bond b) covalent bond
c) ionic bond d) co-ordinate covalent
2. the energy in a molecule is less than the atoms.
a) true b) false
3. the electrons in the innermost shell are called
valence electrons.
a) true b) false
4. the bond formed by sharing of electrons is
called:
a) chemical bond b) covalent bond
c) ionic bond d) co-ordinate covalent
5. the bond formed by the complete transfer of
electrons:
a) chemical bond b) covalent bond
c) ionic bond d) co-ordinate covalent
6. the gases like oxygen, nitrogen, are the result of:
a) chemical bond b) covalent bond
c) ionic bond d) co-ordinate covalent
7. MgO is an example of:
a) chemical bond b) covalent bond
c) ionic bond d) co-ordinate covalent
Chemistry MCQs Dr. Sajid Ali Talpur

5. 8. the idea of chemical bond was introduced in
a) 1808 b) 1910
c) 1816 d) 1916
9. ionic compounds don’t possess molecular
formula.
a) true b) false
10. the atom that donates electrons becomes
negatively charged:
a) true b) false
11. which one is the stable:
a) Na b) Na+
c) Na++
d) Na-
12. ionic compounds are good conductors of
electricity:
a) true b) false
13. covalent compounds are soluble in water:
a) true b) false
14. ionic compounds form the molecules of high
molecular weight.
a) true b) false
15. all are correct about ionic bond except:
a) they conduct electricity in all the states
b) they are soluble in polar solvents
c) ionic compounds do not form molecules
d) N.O.T
Chemistry MCQs Dr. Sajid Ali Talpur

6.  Questions 16 – 18
• Select from the terms below:
A) single covalent bond
B) double covalent bond
C) triple covalent bond
D) ionic bond
E) N.O.T
16. the bond in hydrogen molecule is:
17. the bond in nitrogen molecule is:
18. the bond in CaCl2 is:
19. HCl is an example of:
a) ionic bond b) covalent bond
c) polar covalent bond d) non-polar
20. Cl-
contains electrons in it:
a) 1 b) 2
c) 7 d) 8
 Questions 21 – 33
• Select from the terms below
A) covalent bond
B) polar covalent bond
C) non polar covalent bond
D) ionic bond
E) co-ordinate covalent bond
F) N.O.T
Chemistry MCQs Dr. Sajid Ali Talpur

7. 21. The bond in oxygen molecule is
22. both the electrons are shared by one electrons:
23. also called electrovalent bond:
24. the bond in the table salt
25. the bond in NH4Cl
26. e.n > 1.7
27. the e.n = 0
28. involves the sharing of electrons:
29. formed by sharing of electrons between
dissimilar atoms
30. formed by sharing of electrons between similar
atoms.
31. lone pair of electrons is the indication of the
bond
32. the attraction between electrons and nuclei.
33. the greatest electronegativity difference is
present in:
34. metals are solids except bromine
a) true b) false
Chemistry MCQs Dr. Sajid Ali Talpur

8. 35. metals conduct heat and electricity because of
the presence of:
a) fixed electrons b) free electrons
c) fixed protons d) free protons
36. inter molecular forces hold atoms together in a
molecule:
a) true b) false
37. all of the following are wander wall’s forces
except:
a) dispersion forces b) covalent bond
c) dipole-dipole forces d) H-bonding
38. inter molecular forces are much weaker than
intra molecular forces.
a) true b) false
Answer Key
1 A 2 A 3 B
4 B 5 C 6 B
7 C 8 D 9 A
10 B 11 B 12 B
13 B 14 B 15 A
16 A 17 C 18 D
19 C 20 D 21 C
22 E 23 D 24 D
25 E 26 D 27 C
Chemistry MCQs Dr. Sajid Ali Talpur

9. 28 A 29 B 30 C
31 E 32 F 33 D
34 B 35 B 36 B
37 B 38 B 39
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