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Chemistry JAMB Past Questions

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416

The soft solder used for welding and plumbing is alloy of

  • A. lead and tin
  • B. iron and tin
  • C. lead and zinc
  • D. iron and zinc
View Answer & Discuss (4) JAMB 2007
417

The reddish-brown rust on iron roofing sheets consists of

  • A. Fe3+(H2O)6
  • B. FeO.H2O
  • C. Fe2O3.3H2O
  • D. Fe3O4.2H2O
View Answer & Discuss (12) JAMB 2007
418

Na\(_2\)S\(_2\)O\(_3\)(aq) + 2HCl(aq) → 2NaCl(aq) + H\(_2\)O(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?

  • 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 & Discuss (11) JAMB 2007
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419

The tincture of iodine means iodine dissolved in

  • A. ethanol and water
  • B. bromine chloride
  • C. chlorine water
  • D. water
View Answer & Discuss (1) JAMB 2007
420

Cu\(^{2+}\)(aq) + 4NH\(_3\)(g) ↔ [Cu(NH\(_3\))\(_4\)]\(^{2+}\)(aq)
In the reaction above, what is the effect of precipitating Cu\(^{2+}\)(aq) as CuS(s)?

  • A. NH3(g) concentration will decrease
  • B. more NH3(g)
  • C. The equilibrium will shift to the right
  • D. There will be no effect
View Answer & Discuss (19) JAMB 2007
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