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Friday, 03 April 2026
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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 21:
Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?
  • A Tin
  • B Zinc
  • C Copper
  • D Lead
  • E Aluminium
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Question 22:
Which of the following gases may not be dried with concentrated sulphuric acid?
  • A HCl
  • B N2
  • C Cl2
  • D SO2
  • E NH3
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Question 23:
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
  • A CaCO3(s) CaO(s) + CO2(g)
  • B C(s) + O2(g) CO2(g)
  • C 3FeCO(s) + 2OCO2(g) FeO4(s)
  • D SiO2(s) + CaO(s) CaCO3(s)
  • E CO2(g) + C(s) 2CO(g)
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Question 24:
Which of the following is not a member of the homologous series of the paraffins (alkanes)?
  • A C3H8
  • B C5H12
  • C C7H16
  • D C15H32
  • E C24H48
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Question 25:
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
  • A Ionic bond
  • B Electrovalent bond
  • C Covalent bond
  • D Co-ordinate bond
  • E Hydrogen bond
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