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Chemistry Past Questions and Answers

Chemistry Questions

Question 356:
JAMB 1984
The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is
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  • A 2:1
  • B 1:1
  • C 1:2
  • D 1:4
  • E 1:8
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Question 357:
JAMB 1984
The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is
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  • A H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + Al(OH)<sub style='font-size: smaller;'>2</sub> \(\to\) 2H<sub style='font-size: smaller;'>2</sub>O + AlSO<sub style='font-size: smaller;'>4</sub>
  • B 3H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 2Al(OH)<sub style='font-size: smaller;'>3</sub> \(\to\) 6H<sub style='font-size: smaller;'>2</sub>O + Al<sub style='font-size: smaller;'>2</sub>(SO<sub style='font-size: smaller;'>4</sub>)<sub style='font-size: smaller;'>3</sub>
  • C 3H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 2AlH \(\to\) 6H<sub style='font-size: smaller;'>2</sub>O + Al(SO<sub style='font-size: smaller;'>4</sub>)<sub style='font-size: smaller;'>3</sub>
  • D 3H<sub style='font-size: smaller;'>2</sub> SO<sub style='font-size: smaller;'>4</sub> + 2Al(OH)<sub style='font-size: smaller;'>3</sub> \(\to\) Al(SO<sub style='font-size: smaller;'>4</sub>)<sub style='font-size: smaller;'>3</sub>
  • E H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + Al(OH)<sub style='font-size: smaller;'>3</sub> \(\to\) H<sub style='font-size: smaller;'>2</sub>O + Al<sub style='font-size: smaller;'>2</sub>(SO<sub style='font-size: smaller;'>4</sub>)<sub style='font-size: smaller;'>3</sub>
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Question 358:
JAMB 1984
Which of the following mixtures would result in a solution of pH greater than 7?
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  • A 25.00 cm<sup style='font-size: smaller;'>3</sup> of 0.05 M H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> and 25.00cm<sup style='font-size: smaller;'>3</sup> of 0.50 M Na<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>3</sub>
  • B 25.00 cm<sup style='font-size: smaller;'>3</sup> of 0.05 M H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> and 25.00 cm<sup style='font-size: smaller;'>3</sup> of 0.10 M NaHCO<sub style='font-size: smaller;'>3</sub>
  • C 25.00 cm<sup style='font-size: smaller;'>3</sup> of 0.11 MH<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> and 25.00cm<sup style='font-size: smaller;'>3</sup> 0. 10 M NaOH
  • D 25.00cm<sup style='font-size: smaller;'>3</sup> of 0.11 MH<sub style='font-size: smaller;'>2</sub> SO<sub style='font-size: smaller;'>4</sub> and 50.00 cm<sup style='font-size: smaller;'>3</sup> of 0.05 M NaOH
  • E 25.00cm<sup style='font-size: smaller;'>3</sup> of 0.25 M H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> and 50.00cm<sup style='font-size: smaller;'>3</sup> of 0.20 M NaOH
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Question 359:
JAMB 1984
In which of the following reactions does hydrogen peroxide act as a reducing agent?
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  • A H<sub style='font-size: smaller;'>2</sub>S + H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>2</sub> \(\to\) S + 2H<sub style='font-size: smaller;'>2</sub>O
  • B PbSO<sub style='font-size: smaller;'>3</sub> + H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>2</sub> \(\to\) PbSO<sub style='font-size: smaller;'>4</sub> + H<sub style='font-size: smaller;'>2</sub>O
  • C 2I+ 2H<sup style='font-size: smaller;'>+</sup> + H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>2</sub> \(\to\) I<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>O
  • D PbO<sub style='font-size: smaller;'>2</sub> + 2HNO<sub style='font-size: smaller;'>3</sub> + H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>2</sub> \(\to\) Pb(NO<sub style='font-size: smaller;'>3</sub>)<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>O + O<sub style='font-size: smaller;'>2</sub>
  • E SO<sub style='font-size: smaller;'>2</sub> + H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>2</sub> \(\to\) H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>
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Question 360:
JAMB 1984
For the reaction 2Fe<sup style='font-size: smaller;'>3+</sup> 2I<sup style='font-size: smaller;'>-</sup> \(\to\) 2Fe<sup style='font-size: smaller;'>2+</sup> + I<sub style='font-size: smaller;'>2</sub>, which of the following statements is TRUE?
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  • A Fe is oxidized to Fe<sup style='font-size: smaller;'>3+</sup>
  • B Fe<sup style='font-size: smaller;'>3+</sup> is oxidized to Fe<sup style='font-size: smaller;'>2+</sup>
  • C I<sup style='font-size: smaller;'>-</sup> is oxidized to I<sub style='font-size: smaller;'>2</sub>
  • D I<sup style='font-size: smaller;'>-</sup> is reduced to I<sub style='font-size: smaller;'>2</sub>
  • E I<sup style='font-size: smaller;'>-</sup> is displacing an electron from Fe<sup style='font-size: smaller;'>3+</sup>
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