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Question 40

Match List I with List II.

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  • A - IV: In the metallurgy of copper, a reverberatory furnace is used for smelting copper matte. It separates the metal sulfide from the "slag" (waste) by heating the ore without direct contact with the fuel.
  • B - II : Aluminium is highly reactive and cannot be reduced by carbon. It is extracted via the Hall-Héroult process, which uses electrolysis in a specialized cell to reduce alumina into pure aluminium.
  • C - I : This is the classic industrial method for iron production. Iron ore, coke, and limestone are reacted in a blast furnace to produce pig iron, which is the high-carbon intermediate used to make steel.
  • D - III : Zone refining is used to produce ultra-high purity semiconductors like Silicon and Germanium. It relies on the principle that impurities are more soluble in the molten state than in the solid state.

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