Which of the following statements is/are correct?

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The chemical processes in the production of steel from haematite ore involve reduction followed by oxidation

Lead is extracted from its chief ore galena by both carbon reduction as well as self-reduction

In Hall-Heroult process, the electrolyte used is a molten mixture of alumina and cryolite or fluorspar

Haematite, cassiterite and argentite are oxide ores

answer is 鍗.

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Detailed Solution

Argentite, a silver sulfide mineral.

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