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$\begin{aligned}
& 4 \mathrm{Ag}(\mathrm{s})+8 \mathrm{CN}^{-}(\mathrm{aq})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{aq})+\mathrm{O}_2(\mathrm{~g}) \longrightarrow \longrightarrow \\
& 4\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(\mathrm{aq})+4^{-} \mathrm{OH}(\mathrm{aq})
\end{aligned}$
The above reaction represents the process of concentration of ore in the extraction of silver. This process is
ChemistryGeneral Principles and Processes of Isolation of MetalsTS EAMCETTS EAMCET 2023 (13 May Shift 2)
Options:
  • A Leaching
  • B Levigation
  • C Froth flotation
  • D Liquation
Solution:
1770 Upvotes Verified Answer
The correct answer is: Leaching
The given reaction is cyanide leaching which can be used for metals like $\mathrm{Ag}$ and $\mathrm{Au}$.
Levigation is the process of grinding of an ore into fine powder.
Froth floatation is used for sulphides of $\mathrm{Fe}, \mathrm{Pb}$, etc and is a physical process.
Liquation is used for purifying metals by partially heating them.

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