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Wednesday, 17 June 2026
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Chemistry Past Questions and Answers

Post Utme Chemistry Questions

Question 236:
How many unpaired electrons are there in the electronic configuration of an element with atomic number 8 ?
  • A 2
  • B 3
  • C 4
  • D 5
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Question 237:
The secondary valence is called _____________
  • A Oxidation state
  • B Lewis base
  • C Coordination number
  • D Chelates
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Question 238:
Which of these is not a hydroscopic salt?
  • A Calcium oxide
  • B Magnesium chloride
  • C Copper (II) oxide
  • D Sodium trioxonitrate(V)
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Question 239:
The order of decreasing s-character of \(Sp , Sp ^{3} \& Sp ^{2}\) is _____________
  • A \(Sp , Sp ^{2}, Sp ^{3}\)
  • B \(Sp ^{3}, Sp ^{2}, Sp\)
  • C \(Sp ^{2}, Sp , Sp ^{3}\)
  • D \(Sp , Sp ^{3}, Sp ^{2}\)
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Question 240:
Brass and Bronze are both metallic alloys. <br/>Which of the following constituents is common to both alloys?
  • A Lead
  • B Copper
  • C Tin
  • D Zinc
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