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Thursday, 11 June 2026
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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 266:
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
  • A F < CI < Br < l
  • B L < Br < CI < F
  • C I < CI < Br < F
  • D Br < I < CI < F
  • E CI < F < I < Br
View Answer & Explanation
Question 267:
Which of the following substances is a peroxide?
  • A Na2O2
  • B CuO
  • C PbO4[/sub]
  • D Fe2O[/sub]
  • E AI2O[/sub]
View Answer & Explanation
Question 268:
The component of air that removed when air is bubbled into alkaline pyrogallol solution is
  • A Carbon(lV) oxide
  • B Oxgyen
  • C Water vapour
  • D Nitrogen
  • E Helium
View Answer & Explanation
Question 269:
Which of the following will not affect the degree of hardness in a sample of temporarily hard water?
  • A Addition of washing soda
  • B Adding of soap
  • C Treatment with carbon exchange resin
  • D Filtration
  • E Distillation
View Answer & Explanation
Question 270:
Examples of polymers include the following except
  • A Starch
  • B Nylon
  • C Wool
  • D Perspex
  • E Glass
View Answer & Explanation