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Chemistry WAEC Past Questions

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1261

Chemical reactions occurs when the colliding reactants have energy that is

  • A. less than the activation energy
  • B. greater than the activation energy
  • C. greater than the energy of the product
  • D. less than the energy of effective collision
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1262

The common feature of reactions at the anode is that

  • A. electrons are consumed
  • B. ions are reduced
  • C. oxidation is involved
  • D. the electrode dissolves
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1263

Consider the following reaction equation: \(2NO_{(g)} + O_{{2}{(g)}} \to 2NO_{{2}{(g)}}\). What is the change in the oxidation number of nitrogen?

  • A. +2 to 0
  • B. +2 to -2
  • C. +2 to +4
  • D. +4 to +2
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1264

Which of the following factors characterize members of the same homologous series?

  • A. The chemical property change gradually throughout the series
  • B. physical properties of members are similar
  • C. They have the same molecular formular
  • D. Successive members undergo changes in molecular formula by \(CH_{2}\)
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1265

Calculate the mass of copper deposited if a current of 0.45A flows through \(CuSO_{4}\) solution for 1hour 15mins.   [Cu=64.0, S= 32.0, O =16.0, 1F= 96500C]

  • A. 6.40g
  • B. 0.67g
  • C. 0.64g
  • D. 0.45g
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