Q24 / 160 · TS EAMCET 2023 (13 May Shift 2) · Chemistry

$\begin{aligned} & 4 \mathrm{Ag}(\mathrm{s})+8 \mathrm{CN}^{-}(\mathrm{aq})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{aq})+\mathrm{O}_2(\mathrm{~g}) \longrightarrow \longrightarrow \\ & 4\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(\mathrm{aq})+4^{-} \mathrm{OH}(\mathrm{aq}) \end{aligned}$ The above reaction represents the process of concentration of ore in the extraction of silver. This process is

  • Correct answer
    A
    Leaching
  • B
    Levigation
  • C
    Froth flotation
  • D
    Liquation

Solution

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.

Hence, the correct answer is option: 'A'.

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