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1996

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
1997

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
1998

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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1999

If a gas occupies a volume of 400cm\(^3\) at a temperature of 400K and a pressure of 1 atm, at what temperature and pressure would its volume be 200cm\(^3\)?

  • A. 800 K and 1 atm
  • B. 800 k and 0.5 atm
  • C. 200 k and 1 atm
  • D. 200 k and 0.5 atm
View Answer & Discuss (3) WAEC 2025
2000

The nucleus of a hydrogen atom consists of 

  • A. one proton only
  • B. one proton and one neutron
  • C. one neutron only
  • D. one electron only
View Answer & Discuss (6) WAEC 2025
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