General Principles And Processes Of Isolation Of Metals Question 3
Question 3 - 25 January - Shift 1
Which one of the following reactions does not occur during extraction of copper ?
(1) $2 Cu_2 S+3 O_2 \to 2 Cu_2 O+2 SO_2$
(2) $2 FeS+3 O_2 \to 2 FeO+2 SO_2$
(3) $CaO+SiO_2 \to CaSiO_3$
(4) $FeO+SiO_2 \to FeSiO_3$
Show Answer
Answer: (3)
Solution:
Formula: Extraction of Copper
$CuFeS_2+O_2 \xrightarrow{\text{ Partial roasting }}$
$Cu_2 S+FeO+SO_2+\underset{\text{ very small }}{FeS}+\underset{\text{ very small }}{Cu_2 O}$
$Cu_2 S+O_2 \to Cu_2 O+SO_2$
$FeS+O_2 \to FeO+SO_2$
$FeO+SiO_2 \to FeSiO_3$
No formation of calcium silicate $(CaSiO_3)$ in extraction of $Cu$.
