Question
The correct statement s related to the metal extraction processes is(are)
JEE Advanced
Chemistry
General Principles and Processes of Isolation of Metals
2021
JEE Advanced 2021 (Paper 1)
JEE Advanced Chemistry Question (2021) — Solution
Options
- A. A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO 2 .
- B. In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
- C. Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper.
- D. In cyanide process, zinc powder is utilized to precipitate gold from Na Au CN 2 .
Answer
D. In cyanide process, zinc powder is utilized to precipitate gold from Na Au CN 2 .
Step-by-step solution
A PbS + PbO → Pb + SO 2 It is self-reduction reaction. B In the extraction process of copper from copper pyrites, silica is added to produce Iron silicate. C Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper. Cu 2 S + O 2 → Cu 2 O + SO 2 Cu 2 S + 2 Cu 2 O → self − reduction 6 Cu + SO 2 D Zn + 2 Na Au CN 2 → Na 2 Zn CN 4 + 2 Au
Related: Chemistry — General Principles and Processes of Isolation of Metals · All PYQ Banks