2000 - WAEC Chemistry Past Questions and Answers - page 5
41
A plastic which cannot be softened by heat is described as
A
thermosetting
B
non-biodegradable
C
thermoplastic
D
malleable
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42
Allotropes of an element differ in their
A
physical properties
B
chemical properties
C
mass numbers
D
electronic configuration
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43
What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?
A
32
B
22
C
20
D
10
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44
Given that the electronic configuration of an element X is 1s22s22p63s 23p4, it can be deduced that X
A
belongs to group VI in the Periodic Table
B
belongs to periodic Table
C
contains 3 unpaired electrons in the ground state
D
has atomic number 27
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45
P,Q,R and S are metals in the same group in the Periodic Table but in periods 3,4, 5 and 6 respectively which of them loses electrons least readily?
A
P
B
C
C
R
D
S
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