JEE Main 202124 FebruaryMorning Shift

Exam: JEE Main
Year: 2021
Date: 24 February
Shift: Morning Shift
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2021 · 24 February · Morning Shift · Chemistry · General Principles and Processes of Isolation of Metals

Which of the following ore is concentrated using group 1 cyanide...

Which of the following ore is concentrated using group

1

cyanide salt?

Options

AMalachite
BCalamine
CSiderite
DSphalerite

Correct answer

D. Sphalerite

Step-by-step solution

Sphalerite ore: $ZnS$

Calamine ore: ${ZnCO}_{3}$

Siderite ore: ${FeCO}_{3}$

Malachite ore: $Cu{\left(OH\right)}_{2} \cdot {CuCO}_{3}$
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 $NaCN .$

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