1. The document is a post-test on chemical bonds with 15 multiple choice questions and answers. 2. The questions cover topics like chemical stability of atoms, ion formation, ionic and covalent bonding, Lewis structures, and the periodic table. 3. The final question asks which statement about ionic and covalent bonds is not true - that covalent bonds involve electrostatic force of attraction.

1. CURICULUM DEVELOPMENT CENTRE
POST TEST
TOPIC: 05 CHEMICAL BONDS Time: 15 minutes
Answer all questions. Write your answers in the spaces provided in the table below.
Post Test Answer Table
Question
No.
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15.
Answer
1 Some atoms are chemically stable because
A they have enough electrons.
B they have 8 electrons.
C they have 18 electrons.
D they have octet electron arrangements.
2 Unstable metal atoms can become stable chemically by
A accepting electrons
B releasing electrons
C sharing electrons
D rejecting electrons
3 In the formation of an anion, an atom
A loses proton
B loses electron
C gains proton
D gains electron
4
The figure above shows that
A sodium atom loses an electron.
B sodium atom gains an electron.
C sodium ion gains an electron.
D sodium ion loses an electron
5 What type of bond is formed when non-metal and non-metal atoms combine to form a
compound?
A Ionic bond
B Covalent bond
C Metallic bond
Na e-
+ e−

2. D Van der Waals
6 Electrostatic force of attraction is an attractive force between
A Cations
B Anions
C cation and anion
D atoms and molecules
7 The following are formulae of compounds. Which is/are covalent compound (s)?
I CH4
II MgO
III NO2
IV NaCl
A I only
B I and III only
C II and IV only
D I, II and III only
8 During the formation of ionic bond or covalent bond,
I transfer of electrons will occur
II transfer of protons will occur
III sharing of electrons will occur
IV sharing of protons will occur
A I only
B II only
C I and III only
D II and IV only
9
The diagram shows a molecule of ammonia. In a molecule of ammonia there is/are
A a double covalent bond
B two single covalent bonds
C three single covalent bonds
D four single covalent bonds
10 Atom X and atom Y have electron arrangements of 2.8.1 and 2.6.
What happens to atom X and atom Y when the two atoms combine?
Atom X Atom Y
A Releases one electron Accepts one electron
B Releases one electron Accepts two electrons
C Accepts one electron Releases six electrons
31
H H
H
N

3. D Shares one electron Shares one electron
11 Atoms of Group 1 of the Periodic Table are most likely to form ions with
A a charge of +1 by losing one electron.
B a charge of +2 by losing two electrons
C a charge of -1 by gaining one electron
D a charge of -2 by gaining two electrons
12 Magnesium is in Group 2 and oxygen is in Group 16 of the periodic table. Which of
the following represent the formula for magnesium and oxide ions?
A Mg+
and O−
B Mg2+
and O2−
C Mg2−
and O+
D Mg−
and O2+
13 M and N form ionic compound with the formula of MN2
Which of the following electron arrangements of M and N atoms are correct?
Atom M Atom N
A 2.4 2.8.7
B 2.8.1 2.6
C 2.8.2 2.8.7
D 2.8.5 2.8.7
14 The table below shows electron arrangements for elements J, K, L and M.
Based on the above table and using the letters J, K, L and M as symbols of elements,
the pair of elements that can combine to form a compound are
I J and K
II K and L
III J and L
IV K and M
A II and III only
B II and IV only
C I, II and III only
D II, III and IV only
15 Which of the following statement is not true about ionic and covalent bonds?
A Both covalent and ionic bonds are strong bonds
B Metal and non-metal atoms form ionic bonds
C Covalent bonds are formed as a result of sharing a pair of electrons between two
atoms
D The force of attraction in covalent bond is called electrostatic force of attraction
32
Element Electron arrangement
J 2.8.1
K 2.8.2
L 2.8.7
M 2.8.6

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