2000 - WAEC Chemistry Past Questions and Answers - page 1
1
The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?
A
Q
B
R
C
S
D
T
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2
Chlorine atom forms CI by
A
losing one electron
B
Sharing one electron
C
Donating lone pair of electrons
D
Gaining one electron
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3
An element Z has a combining power of 3. Which of the following formulae is correct of its compounds?
A
ZSO3
B
Z3CI2
C
Z 2O 3
D
ZS3
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4
Electrovalent compounds are characterized by
A
solubility in ethanol
B
high molar mass
C
high melting point
D
strong oxidizing ability
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5
The type of chemical bond that exists between potassium and oxygen in potassium oxide is
A
ionic
B
metallic
C
covalent
D
dative
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6
Which of the following contains co-ordinate covalent bond?
A
HCI
B
CH 4
C
NH4
D
Na+CI
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7
Elactrostatic force of attraction between sodium ion and halide ion is greatest in
A
NaCI
B
NaBr
C
NaF
D
NaI
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8
Which of the following non-metals reacts most readily with metals?
A
Nitrogen
B
Chlorine
C
Sulphur
D
Carbon
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9
A radioactive solid is best stored
A
under paraffin oil
B
under ultraviolet light
C
in a cool, dark cupboard
D
in a box lined with lead
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10
What is the shape of a molecule of CCI4?
A
Pyramidal
B
Tetrahedral
C
Trigonal planar
D
Linear
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