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1291

2\(Na_2O_{2(s)} + 2H_2O_{(1)}\)→ 4\(NaOH_{(s)} +O_{2(g)}\)
The substance that is oxidized in the reaction above is

  • A. \(Na_2O_{2(s)}\)
  • B. NaOH(aq)
  • C. H2O(1)
  • D. O2(g)
View Answer & Discuss (9) JAMB 2012
1292

What number of moles of Cu 2+ will be deposited by 360 coulombs of electricity?
[f = 96500 C mol -1]

  • A. 5.36 x 10 -4 mole
  • B. 1. 87 x 10 10 -3 mole
  • C. 9. 35 x 10 -4 mole
  • D. 3. 73 x 10 -3
View Answer & Discuss (6) JAMB 2012
1293

A metal M displaces zinc from ZnCl solution
This shows that

  • A. electrons flow from zinc to M
  • B. M is more electropositive than zinc
  • C. M is more electonegative than zinc
  • D. zinc is more electropositive than M
View Answer & Discuss (1) JAMB 2012
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1294

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
1295
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 (6) JAMB 2012
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