Depressant used in the concentration of an ore containing ZnS and PbS is :
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a
Na2CO3
b
NaCl
c
NaCN
d
Na2SO4
answer is C.
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Detailed Solution
PbS does’nt react with NaCN and Thus comes to the surface as froth.ZnS reacts with NaCN to form complex and remains in the solution.ZnS + 4NaCN → Na2ZnCN4 + Na2S