Question:medium
Gold is extracted by hydrometallurgical process, based on its property
Gold is extracted by hydrometallurgical process, based on its property
Show Hint
Cyanide process works due to formation of soluble metal complexes.
Updated On: Jun 17, 2026
- of being electropositive
- of being less reactive
- to form complexes which are water soluble
- to form salts which are water soluble
Show Solution
The Correct Option is C
Solution and Explanation
Understanding the Concept:
Gold extraction uses cyanide leaching, where gold forms soluble complex.
Step 1: Reaction: \[ 4Au + 8CN^- + O_2 + 2H_2O \rightarrow 4[Au(CN)_2]^- + 4OH^- \]
Step 2: Key property:
Gold forms stable, soluble complex ions. Final Answer:
Thus, extraction is based on complex formation.
Step 1: Reaction: \[ 4Au + 8CN^- + O_2 + 2H_2O \rightarrow 4[Au(CN)_2]^- + 4OH^- \]
Step 2: Key property:
Gold forms stable, soluble complex ions. Final Answer:
Thus, extraction is based on complex formation.
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