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  4. The metal which is extracted by oxidation and subsequent reduction from its ore is:

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Q. The metal which is extracted by oxidation and subsequent reduction from its ore is:

JEE MainJEE Main 2023General Principles and Processes of Isolation of Elements

Solution:

$Ag$.
$4 Ag +8 CN ^{-}+ O _2+2 H _2 O \rightarrow 4\left[ Ag ( CN )_2\right]^{-}+4 OH ^{-} $
$ 2\left[ Ag ( CN )_2\right]^{-1}+ Zn \rightarrow 2 Ag \downarrow+\left[ Zn ( CN )_4\right]^{-2}$