1994 - WAEC Chemistry Past Questions and Answers - page 3
21
The positive of an element in the Periodic Table is determined by
A
its density
B
its atomic radius
C
its relative atomic mass
D
the number of protons in its atom
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22
Which of the following electronic structures belongs to a noble gas?
A
1s22s2
B
1s 22s22p4
C
1s22s22p63s23p6
D
1s22s22p2
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23
In a chemical reaction, the reacting species possess energy of motion known as
A
potential energy
B
free energy
C
bond energy
D
kinetic energy
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24
The following compounds will decompose on heating except
A
NaHCO3
B
K2CO3
C
MgCO3
D
Ca(HCO3)2
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25
Which of the following reactions is accompanied by the first ionization energy of an element X?
A
X +(aq) → X 2+ (aq) + e-
B
X - (g) → X(g) + e-
C
X+ (g) → X2+ +e-
D
X (g) → X+ (g) +e-
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26
What is the molar of hydrogen sulphide gas in the reaction H2SO4(aq) + 3H2S(g) → 4S(s) + 4H2O (l)n represented by the following equation?
A
Reducing agent
B
A bleaching agent
C
A dehydrating agent
D
A sulphonating agent
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27
Alkanols have unexpectedly high boiling points relative to their molar masses because of intermolecular
A
hydrogen bonding
B
metallic bonding
C
covalent bonding
D
ionic bonding
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28
Sodium chloride is used in the following processes except in the
A
treatment of polluted water
B
preservation of food
C
separation of soap from glycerol
D
manufacture of chlorine
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29
The gaseous product formed when ammonia is passed over heated copper (ll) oxide is
A
oxygen
B
nitrogen
C
hydrogen
D
nitrogen (l) oxide
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30
Which of the following is not a halogen?
A
Silicon
B
Fluorine
C
Astatine
D
Bromine
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