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\( \mathrm{NaCN} \) is sometimes added in the forth flotation process as depressant when \( \mathrm{ZnS} \) and \( \mathrm{PbS} \) minerals are expected because :
(a) \( \mathrm{Pb}(\mathrm{CN})_{2} \) is precipitated while no effect on \( \mathrm{ZnS} \)
(b) \( \mathrm{ZnS} \) forms soluble complex \( \mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{CN})_{4}\right] \) while \( \mathrm{PbS} \) forms froth
(c) \( \mathrm{PbS} \) forms soluble complex \( \mathrm{Na}_{2}\left[\mathrm{~Pb}(\mathrm{CN})_{4}\right] \) while \( \mathrm{ZnS} \) forms froth
(d) \( \mathrm{NaCN} \) is never added in froth floatation process
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