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Thursday, 11 June 2026
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Chemistry Past Questions and Answers

Jamb 2019 Chemistry Questions

Question 51:
In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMol-1 of energy is required. This energy is referred to as
  • A Electron affinity
  • B Ionization energy
  • C Activation evergy
  • D Electronegativity
View Answer & Explanation
Question 52:
Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains
  • A Water vapour
  • B Oxygen
  • C Carbon (IV) oxide
  • D Rare gases
View Answer & Explanation
Question 53:
The method that can be used to convert hard water to soft water is
  • A Chlorination
  • B Passage over activated charcoal
  • C The use of an ion-exchange resin
  • D Aeration
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Question 54:
1s2, 2s2, 2p6, 3s2, 3p6, 3d7, 4s2
An element with the electronic configuration above is a
  • A Non-metal
  • B Metal
  • C Transition element
  • D Group two element
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Question 55:
Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?
  • A HF<sub style='font-size: smaller;'>(g)</sub>
  • B NH<sub style='font-size: smaller;'>3(g)</sub>
  • C Ch<sub style='font-size: smaller;'>4(g)</sub>
  • D HCl<sub style='font-size: smaller;'>(g)</sub>
View Answer & Explanation