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Chemistry WAEC Past Questions

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1646

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
View Answer & Discuss (1) WAEC 2020
1647

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

  • A. 12
  • B. 15
  • C. 16
  • D. 18
View Answer & Discuss (1) WAEC 2020
1648

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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1649

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
View Answer & Discuss (1) WAEC 2020
1650

which of the following quantities is a molar quantity?

  • A. Molarity
  • B. Molar mass
  • C. Mass concentration
  • D. Molality
View Answer & Discuss (8) WAEC 2020
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