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General Principles and processes of Isolation of Elements
medium
Which of the following ore is concentrated using group $1$ cyanide salt ?
A
Sphalerite
B
Calamine
C
Siderite
D
Malachite
(JEE MAIN-2021)
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 $NaCN$.
Standard 12
Chemistry
