JEE Advanced 2021 Paper 1

Section: Chemistry

Question : 34 of 57

Marks: +1, -0

The correct statement(s) related to the metal extraction processes is(are)

[JEE Adv 2021 P1]

A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO2.
In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper.
In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)2]

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