In the extraction process of copper, the product obtained after carrying out the reactions (i) $2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2}$ (ii) $2 \mathrm{Cu}_{2} \mathrm{O}+\mathrm{Cu}_{2} \mathrm{~S} \rightarrow 6 \mathrm{Cu}+\mathrm{SO}_{2}$ is called

JEE Main · 2023 · 11 Apr 2023 · Shift 1 · General Principles and Processes of Isolation of Metals

In the extraction process of copper, the product obtained after carrying out the reactions
(i)

2 Cu_{2} S + 3 O_{2} \to 2 Cu_{2} O + 2 SO_{2}

(ii)

2 Cu_{2} O + Cu_{2} S \to 6 Cu + SO_{2}

is called

(A)Blister copper✓ Correct
(B)Copper scrap
(C)Reduced copper
(D)Copper matte

Answer: (A)

Solution

In the extraction of copper from its sulfide ore, after roasting and reduction, the product obtained is called blister copper. The name comes from its characteristic blistered appearance, which is caused by the evolution of

SO X_{2}

gas during the solidification of molten copper. The reactions shown are the final steps of the extraction process: partial oxidation of

Cu X_{2} S

Cu X_{2} O

, followed by reduction of

Cu X_{2} O

by the remaining

Cu X_{2} S

to produce metallic copper. This copper contains about 98-99% Cu and has a blistered surface due to trapped

SO X_{2}

bubbles.

JEE Main · 2023 · 11 Apr 2023 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on General Principles and Processes of Isolation of Metals →

JEE Main · 2023 · 11 Apr 2023 · Shift 1 · General Principles and Processes of Isolation of Metals

Solution

More JEE Main questions on General Principles and Processes of Isolation of Metals