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What is obtained when a mixture of $Cu_2O$ and $Cu_2S$ is heated?

An ore of metal $'M'$ $\xrightarrow{\text{Roasting}}$ Metal oxide $\xrightarrow{\text{carbon reduction}}$ $'M'$
(After crushing and grinding)
$'M'$ may be :-

Assertion : Zinc can be used while copper cannot be used in the recovery of $Ag$ from the complex $[Ag(CN)_2]^-$.
Reason : Zinc is a more powerful reducing agent than copper.

Carbon can reduce ferric oxide to iron at a temperature above $983 \ K$ because

The process of the isolation of a metal by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal is called

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