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JEE Main · 2022 · 27 Jul 2022 · Shift 2 · General Principles and Processes of Isolation of Metals

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Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if (of) iron is ____.

Answer: 4

Solution

The principal ores of iron among the given list are those that contain iron as the main metal component:
  • Siderite: (iron carbonate)
  • Haematite: (iron(III) oxide)
  • Magnetite: (mixed iron oxide)
  • Limonite: (hydrated iron(III) oxide)

The other ores are:
  • Bauxite (Al), Cuprite (Cu), Calamine (Zn), Kaolinite (Al), Malachite (Cu), Sphalerite (Zn), Cryolite (Al)

Therefore, the answer is 4.

JEE Main · 2022 · 27 Jul 2022 · Shift 2 · Integer answer

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