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Chemistry 2020 WAEC Past Questions

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41

The metallic bond in magnesium is stronger than that in calcium because magnesium has a

  • A. larger atomic size.
  • B. smaller atomic size
  • C. greater number of valence electrons
  • D. lower melting point
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42

Consider the reaction represented by the following equation:

AgNO\(_3\) + NaCl → AgCl + NaNO\(_3\).

The steps that could be taken to obtain pure dry sample of AgCI (s) from the mixture includes

  • A. heating to saturation and drying
  • B. filtering and evaporation to dryness
  • C. filtering, washing and drying
  • D. crystallizing and allowing to cool
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43

How many electrons does  \({31}_{15}\)P\(^3-\) contain?

  • A. 12
  • B. 15
  • C. 16
  • D. 18
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44

The atomic number of an atom would be equal to its mass number if it

  • A. has a totally filled valence shell
  • B. has a high charge to mass ratio
  • C. does not contain neutrons
  • D. exhibits isotopy
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45

Which of the following processes is not exhibited by atoms in order to attain more stable electron configuration?

  • A. Gaining of electrons
  • B. Hybridization of orbitals
  • C. Losing electrons
  • D. Sharing electron
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