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Chemistry WAEC Past Questions

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1216

Atoms are electrically neutral because they

  • A. do not conduct electricity
  • B. contain equal number of protons and electrons
  • C. are composed of neutrons and electrons
  • D. cannot be attracted by electromagnetic field.
View Answer & Discuss WAEC 2018
1217

Common Salt (NaCl) is used to preserve foods. Which of the following properties can be used to determine its purity before use?

  • A. Solubility in water
  • B. Melting point
  • C. Relative density
  • D. Crystalline nature
View Answer & Discuss (6) WAEC 2018
1218

Which of the following electron configurations represents the transition element Chromium \(_{24}Cr\)?

  • A. \(1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{4}\)
  • B. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}\)
  • C. \(1s^{2}2s^{2}2p^{6}3s^{2}3d^{4} 4s^{1}\)
  • D. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)
View Answer & Discuss (11) WAEC 2018
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1219

The atomic number of an isotope of hydrogen is equal to its mass number because it

  • A. has a totally filled valence shell
  • B. has a high charge to mass ratio
  • C. does not contain neutrons
  • D. exhibits isotopy
View Answer & Discuss (1) WAEC 2018
1220

What is the total number of shared pair of electrons in the compound above?

  • A. 5
  • B. 8
  • C. 10
  • D. 12
View Answer & Discuss (4) WAEC 2018
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