1995 - WAEC Chemistry Past Questions and Answers - page 1
1
If a solid has a low melting point and dissolves readily in benzene, it would probably
A
contain strong electrostatic forces of attraction
B
conduct electricity in the molten state
C
dissolve in water
D
have covalent bonding
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2
Which of the following molecules is linear in shape?
A
CH4
B
H2O
C
NH3
D
H2S
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3
Which of the following cannot be deduced from the electronic configuration of a transition metal?
A
Possession of magnetic property
B
Ability to form complex ions
C
Position in the Periodic Table
D
Variable oxidation states
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4
What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)? [O = 16; CU =64]
A
88.9%
B
80.0%
C
66.7%
D
20.0%
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5
A WEAK ACID IS ONE WHICH
A
IS NOT CORROSIVE
B
IS SLIGHTLY IONIZIED IN WATER
C
DOES NOT PRODUCE SALTS WITH ALKALIS
D
DOES NOT CONDUCT AN ELECTRIC CURRENT IN AQUEOUS SOLUTION
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6
Which of the following species is always present in acidified water?
A
NH+4
B
O 2-
C
HCI
D
H3O+
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7
The most suitable method for preparing lead (ll) chloride is by
A
action of dilute HCI on PbSO 4
B
acts of dilute HCI on lead
C
action of dilute HCI on PbCO3
D
bubbling chlorine into a solution of Pb(NO3)2
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8
A positive brown ring test indicates the presence of
A
NO 3
B
Fe 3+
C
SO 2-3
D
CU+
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9
Consider the reaction represented by the equation below: XO + YO → X + YO2 In the reaction, YO acts as
A
an acidic oxide
B
a basic oxide
C
a reducing agent
D
a weak base
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10
Alums are classified as
A
simple salt
B
acid salts
C
anhydrous salts
D
double salts
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