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Chemistry WAEC Past Questions

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1946

At 25\(^0\)C, the saturated solution of a salt in water was found to contain 0.24g of the salt in 100cm\(^3\). What is the solubility of the salt in gdm\(^{-1}\)?

  • A. 0.024
  • B. 0.240
  • C. 2.40
  • D. 24.0
View Answer & Discuss (2) WAEC 2024
1947

The reaction represented by the equation: Ni\(^{2+}\)\((_{aq}\))  + Fe\((_s\)) →  Ni\((_s\))  +  Fe\(^{2+}\)\((_{aq}\)) is a redox reaction because

  • A. Ni\(^{2+}\) ions are oxidized and Fe acts as a oxidizing agent
  • B. Ni\(^{2+}\) ions are oxidized and Fe acts as a reducing agent
  • C. Ni\(^{2+}\) ions are reduced and Fe acts as an oxidizing agent
  • D. Ni\(^{2+}\) ions are reduced and Fe acts as a reducing agent.
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1948

Which of the following statements describes transition elements? They

  • A. are very reactive
  • B. have low melting points
  • C. possess variable oxidation state
  • D. form colourless salts
View Answer & Discuss (5) WAEC 2024
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1949

Aluminium is suitable for making alloys for aircraft construction because it

  • A. is hard and brittle
  • B. is light and very resistant to corrosion
  • C. has high density and also a non-conductor of electricity
  • D. is amphoteric and allotropic
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1950

Which of the following arrangements of elements is in order of increasing ionization energy?

  • A. Si, Al, S, P
  • B. S, P, Si, Al
  • C. Al, Si, P, S
  • D. P, Si, S, Al
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