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Chemistry 2012 JAMB Past Questions

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26

CO(g) + H\(_2\) O\(_{(g)}\) → CO\(_{2(g)}\) + H\(_{2(g)}\)
Calculate the standard heat change of the reaction above, if the standard enthalpies of formation of CO\(_{2(g)}\), H\(_2\)O\(_{(g)}\) and CO\(_{(g)}\) in kJmol\(^{-1}\) are - 394, -242 and - 110 respectively.

  • A. + 262 KJ mol -1
  • B. - 262 KJ mol -1
  • C. + 42 KJ mol -1
  • D. - 42 KJ mol -1
View Answer & Discuss (13) JAMB 2012
27
An increase in entropy can best be illustrated by
  • A. mixing of gases
  • B. freezing of water
  • C. the condensation of vapour
  • D. solidifying candle wax
View Answer & Discuss (4) JAMB 2012
28
The highest rate of production of carbon (lV) oxide can be achieved using
  • A. 0.05 mol -3HCI and 5g powdered CaCO3
  • B. 0.05 mol -3HCI and 5g lump CaCO3
  • C. 0.10 mol -3HCI and 5g powdered CaCO3
  • D. 0.025 mol -3HCI and 5g powdered CaCO3
View Answer & Discuss (1) JAMB 2012
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29
A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be
  • A. sulphur (VI) oxide
  • B. hydrogen chloride
  • C. sulphur (VI) oxide
  • D. hydrogen sulphide
View Answer & Discuss JAMB 2012
30
Which of the following gases has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?
  • A. N2
  • B. N2O
  • C. CI2
  • D. NH3
View Answer & Discuss (1) JAMB 2012
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