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    Cyanide Process MCQ - Practice Questions with Answers

    Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

    Quick Facts

    • 10 Questions around this concept.

    Solve by difficulty

    QuestionEASY

    Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by :

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    Which cyanide process is used for the concentration of gold ore?

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    The following reaction takes place during the process of extraction of gold: 

    Roasted gold ore $+\mathrm{CN}^{-}+\mathrm{O}_2+2 \mathrm{H}_2 \mathrm{O} \rightarrow[\mathrm{X}]+\mathrm{OH}^{-}$

    $$
    [\mathrm{X}]+\mathrm{Zn} \rightarrow[\mathrm{Y}]+\mathrm{Au}
    $$
     

    Identify the compounds [X] and [Y].

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    Concepts Covered - 0

    Gold Cyanidation (Mac-arther forrest process)

    Cyanide process, also called Macarthur-forrest Process, method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide. The process was invented in 1887 by the Scottish chemists John S. MacArthur, Robert W. Forrest, and William Forrest. The method includes three steps:

    • Contacting the finely ground ore with the cyanide solution.
    • Separating the solids from the clear solution.
    • Recovering the precious metals from the solution by precipitation with zinc dust.

    \mathrm{Ag\: +\: NaCN\: +\: H_{2}\O\: +\: \:\frac{1}{2}O_{2}\: \rightarrow \: 2Na[Ag(CN)_{2}]\: +\: 2NaOH}

    \mathrm{2Na[Ag(CN)_{2}]\: +\: Zn\: \rightarrow \: Na_{2}[Zn(CN)_{4}]\: +\: 2Ag\downarrow}
                               more electropositive
                                       metal

    \mathrm{2Na[Au(CN)_{2}]\: +\: Zn\: \rightarrow \: Na_{2}[Zn(CN)_{4}]\: +\: 2Au\downarrow}

    NOTE: It is a metallurgical process/technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex

    Study other Related Concepts

    Cyanide Process Current Topic

    Metallurgy
    Extraction of Metals: Ores and Minerals
    Froth Floatation Process
    Leaching Process
    Cyanide Process
    Calcination and Roasting
    Flux and Slag
    Ellingham Diagram
    Refining Process Against Impurities

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