Gold is extracted by a hydrometallurgical pro | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) Hydrometallurgy is the process of extracting a metal from its ore by dissolving the metal or its ore in a suitable chemical reagent,followed by th

Vedclass · Accepted Answer

To form complexes which are water soluble

Vedclass · Answer

(C) Hydrometallurgy is the process of extracting a metal from its ore by dissolving the metal or its ore in a suitable chemical reagent,followed by the recovery of the metal using a precipitating agent.Gold is extracted by leaching with a dilute solution of $NaCN$ or $KCN$ in the presence of air $(O_2)$,which acts as an oxidizing agent to form a water-soluble complex.$4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) 	o 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$The gold is then recovered from the complex by displacement using a more electropositive metal like zinc:$2[Au(CN)_2]^-(aq) + Zn(s) 	o 2Au(s) + [Zn(CN)_4]^{2-}(aq)$

Gold is extracted by a hydrometallurgical process based on its property:

Similar Questions

The metal which is extracted by oxidation and subsequent reduction from its ore is:

Copper matte contains

In the extraction of metals from sulphide ores,the ore is first converted into an oxide before reduction,rather than reducing the sulphide ore directly,because .....

In the metallurgical extraction of zinc from $ZnO$,the reducing agent used is:

Mark the wrong statement.

Vedclass Test Series

Exam Paper Generator

Online Exam Module