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Thursday, 02 April 2026
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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 6:
JAMB 2007
The soft solder used for welding and plumbing is alloy of
SchoolNGR Classroom
  • A Lead and tin
  • B Iron and tin
  • C Lead and zinc
  • D Iron and zinc
View Answer & Explanation
Question 7:
JAMB 2007
The reddish-brown rust on iron roofing sheets consists of
SchoolNGR Classroom
  • A Fe3+(H2O)6
  • B FeO.H2O
  • C Fe2O3.3H2O
  • D Fe3O4.2H2O
View Answer & Explanation
Question 8:
JAMB 2007
Na2S2O3(aq) + 2HCl(aq) → 2NaCl(aq) + H2O(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?
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  • A An increase in temperature and decrease in the concentration of the reactant
  • B A decrease in the volume and increase in the pressure of the reactant
  • C A decrease in the temperature and an incease in the concentration of the reactant
  • D An increase in temperature and an increase in the concentration of the reactant
View Answer & Explanation
Question 9:
JAMB 2007
The tincture of iodine means iodine dissolved in
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  • A Ethanol
  • B Bromine chloride
  • C Chlorine water
  • D Water
View Answer & Explanation
Question 10:
JAMB 2007
Cu2+(aq) + 4NH3(g) ↔ [Cu(NH3)4]2+(aq)
In the reaction above, what is the effect of precipitating Cu2+(aq) as CuS(s)?
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  • A NH3(g) concentration will decrease
  • B More NH3(g)will be generated
  • C The equilibrium will shift to the right
  • D There will be no effect
View Answer & Explanation

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