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Chemistry Past Questions

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1506
Stainless steel is an alloy of
  • A. carbon, iron and lead
  • B. carbon, iron and chromium
  • C. carbon, iron and copper
  • D. carbon, iron and silver
  • E. carbon and iron only
View Answer & Discuss (5) JAMB 1983
1507
Which volume of 0.5 M H 2SO4 will exactly neutralize 20 cm 3 of 0.1 M NaOH solution?
  • A. 2.0 cm 3
  • B. 5.0 cm 3
  • C. 6.8 cm 3
  • D. 8.3 cm 3
  • E. 10.4 cm 3
View Answer & Discuss (4) JAMB 1983
1508
Which of the following pair of gases will NOT react further with oxygen at a temperature between 30oC AND 400oC
  • A. SO2 and NH3
  • B. CO2 and H2
  • C. NO2 and SO3
  • D. SO3 and NO
  • E. CO and H2
View Answer & Discuss (19) JAMB 1983
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1509

Some metals are extracted from their ores after some preliminary treatments by electrolysis (L), some by thermal decomposition(T), some by a combination of both processes (TL). Which set-up in the following for the extraction of iron, copper, and aluminium is correct?

  • A. lron (L), copper (L) aluminium (T)
  • B. lron (T) copper (L) aluminium (T)
  • C. lron (TL) copper (TL) aluminium (TL)
  • D. Iron (L) copper (T) aluminium (T)
  • E. lron (T) copper (L), aluminium (TL)
View Answer & Discuss (21) JAMB 1983
1510
In the preparation of some pure crystals of Cu (NO3)2 starting with CuO, a student gave the following statements as steps he employed. Which of these shows a flaw in his report ?
  • A. some CuO was reacted with excess dilute H2SO4
  • B. the solution was concentrated
  • C. when the concentrate was cooled, crystals formed were removed by filtration
  • D. the crystals were washed with very little cold water
  • E. the crystals were then allowed to dry
View Answer & Discuss (6) JAMB 1983
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