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Chemistry Past Questions

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4591

When a sample of air is passed through alkaline pyrogalol, potash and finally through U-tube containing fused calcium chloride, the components of air left unabsorbed are 

  • A. nitrogen and carbon(IV)oxide
  • B. noble gases and carbon(IV)oxide
  • C. noble gases and nitrogen
  • D. noble gases, nitrogen and carbon(IV) oxide
View Answer & Discuss (1) JAMB 2025
4592

An atom of element with the configuration 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^5\) is likely to belong to

  • A. group 7
  • B. group 5
  • C. group 2
  • D. group 3
View Answer & Discuss (7) JAMB 2025
4593

A molecule with a polar covalent bond between atoms exhibits

  • A. unequal sharing of electron pair
  • B. equal sharing of electron pair
  • C. equal sharing of electron lone pair
  • D. unequal sharing of electron lone pair
View Answer & Discuss (11) JAMB 2025
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4594

Mg + Pb\(^{2+}\) →  Mg\(^{2+}\) + Pb

What is the cell notation for the cell reaction above?

  • A. MgIPb\(^{2+}\)IIMg\(^{2+}\)IPb
  • B. MgIMg\(^{2+}\)IIPbIPb\(^{2+}\)
  • C. MgIMg\(^{2+}\)IIPb\(^{2+}\)IPb
  • D. MgIMg\(^+\)IIPbIPb\(^+\)
View Answer & Discuss (3) JAMB 2025
4595

The correct arrangement of gases in the order of increasing rate of diffusion is

[H = 1, C = 12, N = 14, O = 16, S = 32]

  • A. CO\(_2\), H\(_2\), SO\(_2\), CO
  • B. SO\(_2\), O\(_2\), NH\(_3\), H\(_2\)
  • C. NH\(_3\), NO\(_2\),N\(_2\), CO\(_2\)
  • D. CO\(_2\), NH\(_3\), O\(_2\), SO\(_2\)
View Answer & Discuss (2) JAMB 2025
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