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    Why zns stop forming froath when it PBS and zns when nacn is added

    Sudeep Reddy 13th Mar, 2019
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    Answer (1)
    syed seerat 14th Mar, 2019
    A common depressant used in the froth floatation of lead sulphide is sodium cyanide. When the ore containing ZnS and PbS is subjected to froth floatation process in the presence of NaCN, then only PbS forms the froth. This happens because NaCN reacts with ZnS to form Na2[Zn(CN)4].
    4NaCN + ZnS -----> Na2[Zn(CN)4] + Na2S
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