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2691

The purity of a solid sample can best be determined by its?

  • A. boiling point
  • B. melting point
  • C. conductivity
  • D. solubility
View Answer & Discuss (3) WAEC 2014
2692
Which of the following gases is used to retard the vaporization of the filament in a light bulb?
  • A. Argon
  • B. Helium
  • C. Hydrogen
  • D. Oxygen
View Answer & Discuss (2) WAEC 2014
2693
The most common process in the extraction of metals from their ore is
  • A. catalysis
  • B. electrolysis
  • C. oxidation
  • D. reduction
View Answer & Discuss (14) WAEC 2014
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
2694

The oxide from electric power station is

  • A. carbon (IV) oxide
  • B. copper (ll) oxide
  • C. nitrogen (IV) oxide
  • D. sulphur (IV) oxide
View Answer & Discuss (9) WAEC 2014
2695

If the relative molecular mass of an element is not a whole number, it can be deduced that the element is

  • A. naturally radioactive
  • B. abundant in nature
  • C. a transition metal
  • D. an isotopic mixture
View Answer & Discuss (5) WAEC 2002
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