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Chemistry WAEC Past Questions

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2001

If acidified K\(_2\)Cr\(_2\)O\(_7\) acts as an oxidizing agent, the colour changes from

  • A. orange to red
  • B. yellow to green
  • C. orange to green
  • D. yellow to red
View Answer & Discuss (3) WAEC 2025
2002

Which of the following elements is a metalloid?

  • A. Aluminium
  • B. Selenium
  • C. Phosphorus
  • D. Sodium
View Answer & Discuss (2) WAEC 2025
2003

Iodine could be separated from the mixture of iodine and Calcium chloride by

  • A. Evaporation
  • B. Sublimation
  • C. fractional distillation
  • D. fractional crystallization
View Answer & Discuss (4) WAEC 2025
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2004

Sodium chloride is used in the following processes except

  • A. treatment of water
  • B. manufacturing of chloride
  • C. preservation of food
  • D. separation of soap glycerol
View Answer & Discuss (2) WAEC 2025
2005

Which of the following bonds is not an intermolecular force?

  • A. Hydrogen bond
  • B. Van der waal's
  • C. dipole-dipole
  • D. metallic bond
View Answer & Discuss (1) WAEC 2025
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