Which one of the following ores does not contain iron"

CONCEPT:

Ores and their Metal Content

• An ore is a naturally occurring solid material from which a metal or valuable mineral can be extracted profitably.
• Different ores contain different metals, and identifying the metal content is essential in metallurgy.

EXPLANATION:

• Considering the options given:
  • Hematite (Fe₂O₃):
    • Hematite is an iron ore containing iron in the form of iron(III) oxide (Fe₂O₃).
  • Magnetite (Fe₃O₄):
    • Magnetite is also an iron ore containing iron in the form of iron(II,III) oxide (Fe₃O₄).
  • Calamine (ZnCO₃):
    • Calamine is a zinc ore containing zinc in the form of zinc carbonate (ZnCO₃).
    • It does not contain iron.
  • Siderite (FeCO₃):
    • Siderite is an iron ore containing iron in the form of iron(II) carbonate (FeCO₃).

Therefore, the correct answer is option 3: Calamine (ZnCO₃) does not contain iron.