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Chemistry JAMB Past Questions

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1761

Hydrogen is not liberated when trioxonitrate(v)acid reacts with zinc because

  • A. zinx is not rendered passive by acid
  • B. hydrogen produced is oxidized to water
  • C. oxides of nitrogen are produced
  • D. all nitrates are soluble in water
  • E. trioxonitrate(v)acid is a strong acid
View Answer & Discuss (6) JAMB 1985
1762
The boiling point of water, ethanol, toluene and butan-2-ol are 373.0k, 351.3k, 383.6k and 372.5k respectively. Which liquid has the highest vapour pressure at 323.0k?
  • A. water
  • B. toluene
  • C. ethanol
  • D. butan-2-ol
  • E. none
View Answer & Discuss (19) JAMB 1985
1763
In what respect will two dry samples of nitrogen gas differ from each other if sample 1 is prepared by completely removing CO2 and O2 from air, and sample 2 is prepared by passing purified nitrogen(i)oxide over heated copper? sample 1 is
  • A. purer than sample 2
  • B. slightly denser than sample 2
  • C. in all respects the same as sample 2
  • D. colourless but sample 2 has a light brown colour
  • E. slightly less reactive than sample 2
View Answer & Discuss (1) JAMB 1985
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1764

Copper sulphate solution is electolysed using platinum electrodes A. current of 0.193 amperes is passed for 2hrs. How many grams of copper are deposited? (cu = 63.5, F = 96500 coulombs)

  • A. 0.457g
  • B. 0.500g
  • C. 0.882g
  • D. 0.914g
  • E. 1.00g
View Answer & Discuss (11) JAMB 1985
1765

In the above experiment, the litmus paper will initially

  • A. be bleached
  • B. turn green
  • C. turn red
  • D. turn blue
  • E. turn black
View Answer & Discuss (8) JAMB 1983
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