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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1621:
WAEC 2020
Group VIl elements in their combined states are called?
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  • A Halogens
  • B Anions
  • C Halide
  • D Cations
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Question 1622:
WAEC 2020
When an ionic bond is broken, bonding electrons are
SchoolNGR Classroom
  • A Shared between participating atoms
  • B Gained by the most electropositive atom
  • C Gained by the most electronegative atom
  • D Lost by both participating atoms.
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Question 1623:
WAEC 2020
The oxidation state of chlorine in NaClO\(_3\) is?
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  • A +1
  • B +3
  • C +5
  • D +6
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Question 1624:
WAEC 2020
A balanced chemical equation is based on the law of?
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  • A Periodicity
  • B Constant composition
  • C Multiple proportion
  • D Conservation of mass
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Question 1625:
WAEC 2020
Which of the following pairs of elements has the greatest difference in electronegativity?
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  • A Na and F
  • B Na and CI
  • C Na and Br
  • D Na and I
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