JEE Advanced 2021 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Advanced 2021

Not in JEE Main or NEET syllabus

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

(A)A mixture of PbS and PbO undergoes self-reduction to produce Pb and .Correct
(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.Correct
(D)In cyanide process, zinc powder is utilized to precipitate gold from .Correct

Answer: (A),(C),(D)

Solution

(A) – the sulfide itself reduces the oxide (self-reduction) – correct. (B) Silica is added to remove iron as slag (), not to make copper silicate – incorrect. (C) The sulfide ore is partially roasted,

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Question ID VK-033873