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Q.
Which of the following ore is concentrated using group 1 cyanide salt ?
JEE MainJEE Main 2021General Principles and Processes of Isolation of Elements
Solution:
Sphalerite ore : $ZnS$
Calamine ore : $ZnCO _{3}$
Siderite ore : $FeCO_3$
Malachite ore : $Cu ( OH )_{2} \cdot CuCO _{3}$
It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants'. In case of an ore containing $ZnS$ and $PbS ,$ the depressant used is $NaCN$.