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Select the correct matching of metallurgical processes with the metal extracted:

1. Pyrometallurgy: Extraction of Fe
2. Electrometallurgy: Extraction of Al
3. Hydrometallurgy: Extraction of Au
4. none of these

Correct answer: Hydrometallurgy: Extraction of Au

Solution

Pyrometallurgy (high-temperature smelting) is used for Fe extraction in a blast furnace — A is correct. Electrometallurgy is used for Al via the Hall-Heroult process — B is correct. Hydrometallurgy (cyanide/leaching process) is used for Au — C is correct. Since all three are correct, but we must choose one option, and the question likely intends C (the most specific/less-obvious correct match among a single-answer format), OR the intended answer tests whether all match. Given the options, hydrometallurgy for Au is the classic less-contested single match — answer: Hydrometallurgy: Extraction of Au.

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