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Chemistry JAMB Past Questions

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1766

In the experiment above, a current was passed for 10 minutes, and 0.63g of copper was found to be deposited on the cathode of CuSO4 cells. The weight of silver deposited on the cathode of AgNO3 cell during the same period would be? [Cu = 63, Ag = 108]

  • A. 0.54g
  • B. 1.08g
  • C. 1.62g
  • D. 2.16g
  • E. 3.24g
View Answer & Discuss (21) JAMB 1983
1767
1.00g of mixture of calcium carbonate and calcium oxide liberated 0.33g of carbon dioxide on strong heating. The percentage of calcium oxide in the mixture is? (Ca = 40, C = 12, O = 16)
  • A. 5
  • B. 15
  • C. 25
  • D. 35
  • E. 50
View Answer & Discuss (3) JAMB 1982
1768
Which of the following represents a precipitation reaction?
  • A. H2SO4 + NaCl \(\to\) NaHSO4 + HCl
  • B. Fe +H2SO4 \(\to\) FeSO4 + H2
  • C. 4HCl + MnO2 \(\to\) MnCl2 + 2H2O + Cl2
  • D. Na2SO4 + pb(NO3) \(\to\) PbSO4 + 2NaNO
  • E. CuO +2HCl \(\to\) Cl2 + H2O
View Answer & Discuss (7) JAMB 1981
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1769
The following arrangement of elements in order of decreasing number of outer electrons; One of the elements is wrongly placed. Which is it? ALUMINIUM, CHLORINE, SILICON, MAGNESIUM AND SODIUM.
  • A. chlorine
  • B. aluminium
  • C. silicon
  • D. magnesium
  • E. sodium
View Answer & Discuss (11) JAMB 1980
1770

Which of the following tests would confirm-unequivocally that a solution X contain the sulphate ion if it gives with?

  • A. silver nitrates solution, a white precipates insoluble in dilute HNO3
  • B. barium chloride solution, a white precipitate insoluble in dilute H2SO4
  • C. barium chloride solution, a white precipitate soluble in dilute HCl
  • D. barium chloride solution a white precipitate soluble in dilute ammonia
  • E. barium chloride solution a white precipitate insoluble in dilute HCl
View Answer & Discuss (9) JAMB 1980
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