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In the extraction of copper from its sulphide ore,the metal is formed by reduction of $Cu_2O$ with

When silica is present as an impurity in an ore,a/an ........ flux is required.

In the extraction of copper,its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

In the aluminothermite process,aluminium acts as:

$CN^{-}$ solution is used in the extraction of which metal?

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