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126
Which of the following is not a direct petroleum product?
A.
Methane
B.
Ethanol
C.
Petrol
D.
Vaseline
E.
Kerosene
View Answer & Discuss (10)
WAEC 1991
127
How many principal electronic shells has an atom whose electronic configuration is shown below? 1s
2
2s
2
2p
6
3s
1
A.
1
B.
2
C.
3
D.
4
E.
11
View Answer & Discuss (3)
WAEC 1991
128
Which of the following properties is not characteristic of electrovalent compounds?
A.
formation of crystalline solids
B.
solubility in polar solvents
C.
high vapour pressures
D.
high melting and boiling points
E.
ability to conduct electricity in aqueous solution
View Answer & Discuss (4)
WAEC 1991
129
Compounds that have the same molecular formula but different structures are said to be
A.
allotropic
B.
polymorphic
C.
polymeric
D.
isomeric
E.
isotopic
View Answer & Discuss (2)
WAEC 1991
130
In which of the following crystals are the particles held by van der Waal's forces only?
A.
Sodium chloride
B.
Ice
C.
Diamond
D.
Iodine
E.
Quartz
View Answer & Discuss (2)
WAEC 1991
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