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Chemistry 2000 WAEC Past Questions

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NECO offline past questions - All questions, answers & explanations in one app 25712
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41
A plastic which cannot be softened by heat is described as
  • A. thermosetting
  • B. non-biodegradable
  • C. thermoplastic
  • D. malleable
View Answer & Discuss (1) WAEC 2000
42
Allotropes of an element differ in their
  • A. physical properties
  • B. chemical properties
  • C. mass numbers
  • D. electronic configuration
View Answer & Discuss (3) WAEC 2000
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
View Answer & Discuss (2) WAEC 2000
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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
View Answer & Discuss (3) WAEC 2000
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
View Answer & Discuss (8) WAEC 2000
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