The correct statement(s) related to the metal extraction pr…

Maths JEE - Advanced Previous Year Paper JEE-Advanced-2021-Paper-1 Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

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

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 ].

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a, c, d)

PbS + 2PbO 3Pb + SO 2

So option is correct.

In the extraction Cu from copper pyrite CuFeS 2

SiO 2 is added to remove FeO as slag FeSiO 3 .

So option is wrong.

FeS + O 2 FeO + SO 2

Cu 2 S + O 2 Cu 2 O + SO 2

Cu 2 S + 2Cu 2 O 6Cu +SO 2

(Blister copper)

So, option is correct.

Zn + 2Na[Au(CN) 2 ] Na 2 [Zn(CN) 4 ] + 2Au

So, option is correct.

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