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1

Zinc Oxide is a?

  • A. Basic Oxide
  • B. Acidic Oxide
  • C. Amphoteric Oxide
  • D. Neutral Oxide
  • E. Reactive Oxide
View Answer & Discuss (269) JAMB 1978
2

The property used in the industrial preparation of nitrogen and oxygen from air is?

  • A. rate of diffusion
  • B. density
  • C. boiling point
  • D. solubility
View Answer & Discuss (11) JAMB 2005
3

In the diagram above, which of the curves represents the evolution of oxygen with time in the equation 2KClO3(s) → 2KCl(s) + 3O2(g)?

  • A. X
  • B. Y
  • C. Z
  • D. R
View Answer & Discuss (5) JAMB 2009
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
4

The gas that is most useful in protecting humans against solar radiation is?

  • A. chlorine
  • B. ozone
  • C. carbon (IV) oxide
  • D. hydrogen sulphide
View Answer & Discuss (19) JAMB 2009
5

In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by?

  • A. lowering the pressure of the reaction
  • B. increasing the surface area of the reactant
  • C. increase the rate of the reaction
  • D. lowering the energy barrier of the reaction
View Answer & Discuss (10) JAMB 2010
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