Analogy — Identify the ore relationship: Aluminium : Bauxite :: Iron : ? Select the ore that stands to Iron as Bauxite stands to Aluminium.
Correct Answer: Haematite
Introduction / Context:In this analogy, the first pair links a metal to one of its principal ores: Aluminium is obtained from Bauxite. We must choose the iron ore that parallels this metal→ore relationship.
Given Data / Assumptions:
- Bauxite is a primary ore of aluminium.
- Common iron ores include Haematite and Magnetite; Pyrite (iron pyrites) is not a principal commercial iron ore due to sulfur content.
- “Pynolosite” appears to be a misspelling; Manganese ore is “Pyrolusite”. We apply the Recovery-First Policy to treat it as a distractor.
Concept / Approach:Maintain the “metal : principal ore” mapping. For iron, “Haematite” (Fe2O3) is a canonical commercial ore, widely referenced in examinations.
Step-by-Step Solution:
1) Identify relation: Metal → chief ore.2) Map Iron → Haematite fits as a standard iron ore.3) Eliminate distractors: Pyrite (FeS2) is iron sulfide and not a typical source of iron metal; Magnesite is magnesium carbonate (MgCO3), not iron ore; “Pynolosite” (likely Pyrolusite) is a manganese ore (MnO2).Verification / Alternative check:Iron’s principal ores in textbooks: Haematite, Magnetite; of the given choices, only Haematite qualifies.
Why Other Options Are Wrong:
- Pyrite: Sulfide mineral; not a commercial iron ore.
- Magnesite: Magnesium ore/mineral, unrelated to iron.
- Pynolosite (Pyrolusite): Manganese ore; not iron.
- None of these: Incorrect since Haematite is valid.
Common Pitfalls:Choosing Pyrite because it contains iron; the presence of sulfur prevents its use as a principal iron ore.
Final Answer:Haematite