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NEET Chemistry Metallurgy / धातुकर्म Question Bank Self Evaluation Test - General Principals and Process of Isolation of Elements

  • question_answer
    Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?

    A) Galena             

    B) Copper pyrite

    C) Sphalerite         

    D) Argentite

    Correct Answer: D

    Solution :

    [d] Leaching is the selective dissolution of the desired mineral leaving behind the impurities in a suitable dissolving agent e.g., Argentitie or Silver glance, \[A{{g}_{2}}S\] is an ore of silver. Silver is extracted from argentite by the mac-Arthur and Forest process (leaching process). \[A{{g}_{2}}S+4NaCN\to 2Na[Ag{{(CN)}_{2}}]+N{{a}_{2}}S\] \[4Au+8KCN+2{{H}_{2}}O+{{O}_{2}}\to \] \[4K[Au{{(CN)}_{2}}]+4KOH\]


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