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Chemistry 1984 JAMB Past Questions

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6
Naphthalene when heated melts at 354 K (81 oC). At this temperature the molecules of naphthalene
  • A. decompose into smaller molecules
  • B. change their shape
  • C. are oxidized by atmospheric oxygen
  • D. contract
  • E. become mobile as the inter molecular forces are broken
View Answer & Discuss JAMB 1984
7
The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is
  • A. 2:1
  • B. 1:1
  • C. 1:2
  • D. 1:4
  • E. 1:8
View Answer & Discuss (17) JAMB 1984
8
The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is
  • A. H2SO4 + Al(OH)2 \(\to\) 2H2O + AlSO4
  • B. 3H2SO4 + 2Al(OH)3 \(\to\) 6H2O + Al2(SO4)3
  • C. 3H2SO4 + 2AlH \(\to\) 6H2O + Al(SO4)3
  • D. 3H2 SO4 + 2Al(OH)3 \(\to\) Al(SO4)3
  • E. H2SO4 + Al(OH)3 \(\to\) H2O + Al2(SO4)3
View Answer & Discuss (7) JAMB 1984
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9
Which of the following mixtures would result in a solution of pH greater than 7?
  • A. 25.00 cm3 of 0.05 M H2SO4 and 25.00cm3 of 0.50 M Na2CO3
  • B. 25.00 cm3 of 0.05 M H2SO4 and 25.00 cm3 of 0.10 M NaHCO3
  • C. 25.00 cm3 of 0.11 MH2SO4 and 25.00cm3 0. 10 M NaOH
  • D. 25.00cm3 of 0.11 MH2 SO4 and 50.00 cm3 of 0.05 M NaOH
  • E. 25.00cm3 of 0.25 M H2SO4 and 50.00cm3 of 0.20 M NaOH
View Answer & Discuss (18) JAMB 1984
10
In which of the following reactions does hydrogen peroxide act as a reducing agent?
  • A. H2S + H2O2 \(\to\) S + 2H2O
  • B. PbSO3 + H2O2 \(\to\) PbSO4 + H2O
  • C. 2I+ 2H+ + H2O2 \(\to\) I2 + 2H2O
  • D. PbO2 + 2HNO3 + H2O2 \(\to\) Pb(NO3)2 + 2H2O + O2
  • E. SO2 + H2O2 \(\to\) H2SO4
View Answer & Discuss (13) JAMB 1984
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