Metallurgy Chemistry - Metallurgy

• A
  $Zn _{( s )}+ Cu _{( aq )}^{2+} \longrightarrow Cu _{( s )}+ Zn _{( aq )}^{2+}$
  
• ✓
  $Cu _{( s )}+ Zn _{( aq )}^{2+} \longrightarrow Zn _{( s )}+ Cu _{( aq )}^{2+}$
  
• C
  $Cu _{( s )}+2 Ag _{( aq )}^{+} \longrightarrow 2 Ag _{( s )}+ Cu _{( aq )}^{2+}$
  
• D
  $Fe _{( s )}+ Cu _{( aq )}^2 \longrightarrow Cu _{( s )}+ Fe _{( aq )}^{2+}$
  

Answer: B.

• A
  Smelting
  
• B
  Calcination
  
• C
  Roasting
  
• ✓
  Electromagnetic separation
  

Answer: D.

• A
  A - (i), B - (ii), C - (iii), C - (iv)
• B
  A - (iii), B - (iv), C - (v), C - (i)
• ✓
  A - (iv), B - (ii), C - (iii), C - (i)
• D
  A - (ii), B - (iii), C - (i), C - (v)

Answer: C.

• A
  - $\Delta G _{ f }^0$ of sulphide is greater than those for $CS _2$ and $HS _2$.
• B
  - $\Delta G _{ r }^0$ is negative for roasting of sulphide ore to oxide.
• C
  - Roasting of the sulphide to its oxide is thermodynamically feasible.
• ✓
  - Carbon and hydrogen are suitable reducing agents for metal sulphides.

Answer: D.

• ✓
  Al
  
• B
  Ni
  
• C
  Cu
  
• D
  Zn
  

Answer: A.