Question

When the more electropositive metal displaces less electropositive metal from its salt solution, this process is called:

• A. auto reduction
• B. electro reduction
• C. hydrometallurgy
• D. none of these

Hint:

Cementation (metal displacement) is a part of hydrometallurgy.

Answer 1

The Correct Option is C

Concept: Hydrometallurgy involves extraction of metals using aqueous solutions, including displacement reactions.

Step 1: Understand the process.
\[ Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu \]

Step 2: Identify process.
This type of displacement in aqueous solution is part of hydrometallurgy (cementation process). Conclusion:
Correct answer is hydrometallurgy.