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Chemistry 2025 WAEC Past Questions

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1

Which of the following pairs of gases cannot be collected by downward delivery?

  • A. SO\(_2\) and NH\(_3\)
  • B. CO and N\(_2\)
  • C. Cl\(_2\) and N\(_2\)
  • D. SO\(_2\) and N\(_2\)
View Answer & Discuss (6) WAEC 2025
2

Nickel is used in the hydrogenation of alkenes because it

  • A. Increases the yield of the product
  • B. lowers the activation energy of the reaction
  • C. makes the reaction more exothermic
  • D. prevents a reverse reaction from occuring
View Answer & Discuss (6) WAEC 2025
3

Aluminum is extracted by

  • A. electrolysis of the purified ore
  • B. froth floatation of the smelted ore
  • C. reduction of the ore with coke in a furnace
  • D. roasting the ore in excess supply of air
View Answer & Discuss (4) WAEC 2025
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4

Which of the following gases is used in fire extinguishers?

  • A. Carbon(IV)oxide
  • B. Nitrogen(IV)oxide
  • C. Carbon(II)oxide
  • D. Sulphur(IV)oxide
View Answer & Discuss (11) WAEC 2025
5

Both Na\(^+\) and K\(^+\) have 

  • A. tendency to give electrons
  • B. positive reduction potential
  • C. tendency to accept electrons
  • D. negative oxidation potential
View Answer & Discuss (4) WAEC 2025
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