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Thursday, 11 June 2026
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Chemistry Past Questions and Answers

Chemistry Questions

Question 2656:
WAEC 2001
A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by
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  • A Evaporation
  • B Sublimation
  • C Distillation
  • D Filtration
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Question 2657:
WAEC 2001
Which of the following would dissolve in warm dilute H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> without effervescence, to give a blue solution?
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  • A Copper turnings
  • B Copper (ll) trioxocarbonate (IV)
  • C Copper (ll) oxide
  • D Copper alloy
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Question 2658:
WAEC 2001
In which of the reactions represented by the following equations is HNO<sub style='font-size: smaller;'>3</sub> behaving as a typical acid?
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  • A CaO + 2HNO<sub style='font-size: smaller;'>3</sub> → Ca(NO<sub style='font-size: smaller;'>3</sub>) <sub style='font-size: smaller;'>2</sub> + H <sub style='font-size: smaller;'>2</sub>O
  • B Cu + 4HNO<sub style='font-size: smaller;'>3</sub> → Cu(NO <sub style='font-size: smaller;'>3</sub>)<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>O + 2NO<sub style='font-size: smaller;'>2</sub>
  • C S + 6HNO<sub style='font-size: smaller;'>3</sub> → H<sub style='font-size: smaller;'>2</sub>SO <sub style='font-size: smaller;'>4</sub> + 6NO<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>O
  • D P + 5HNO<sub style='font-size: smaller;'>3</sub> → H <sub style='font-size: smaller;'>3</sub>PO <sub style='font-size: smaller;'>4</sub> + 5NO<sub style='font-size: smaller;'>2</sub> + H<sub style='font-size: smaller;'>2</sub>O
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Question 2659:
WAEC 2001
A gas was evolved when a sample of gastric juice reacted with sodium trioxocarbonate (IV) . The gas evolved was
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  • A NH<sub style='font-size: smaller;'>3</sub>
  • B SO<sub style='font-size: smaller;'>2</sub>
  • C HCI[sub][/sub]
  • D CO<sub style='font-size: smaller;'>2</sub>
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Question 2660:
WAEC 2001
It can be concluded that gastric juice
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  • A Contains enzymes
  • B Is acidic
  • C Is a mixture
  • D Has pH value of 7
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