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NEET Sample Paper NEET Sample Test Paper-60

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

    A) Sphalerite         

    B) Argentine

    C) Galena                         

    D) Copper pyrite

    Correct Answer: B

    Solution :

    [b] Argentite Argentite \[[A{{g}_{2}}S]\] being a low grade are is preferably extracted by leaching with NaCN. Leaching of silver: \[4\,Ag+8NaCN+{{O}_{2}}+2{{H}_{2}}O\to \]                         \[4\,Ag+[Ag{{(CN)}_{2}}]+4NaOH\] \[or\,\,A{{g}_{2}}S+4NaCN\to 2Na[Ag{{(CN)}_{2}}]+N{{a}_{2}}S\] \[(soluble\,complex)\]


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