Question

Consider the leaching of Ag and Au and the metal is obtained later by displacement reaction using Zn. Find out the correct statement.


1) In case of Ag, a complex of coordination number equal to 4 is obtained
2) Au forms a complex of coordination number 4 during leaching
3)Zn forms a complex of coordination number 2 during leaching
4)NaCN can be used in aqueous medium for the leaching of Ag and Au

Answer 1

Answer:

4) NaCN can be used in aqueous medium for the leaching of Ag and Au

hope this will help you

Answer 2

Answer:

4) NaCN can be used in an aqueous medium for the leaching of Ag and Au.

Explanation:

• Sodium cyanide in an aqueous medium is used for the leaching process of gold and silver.
• The gold and silver get stabilized when reacted with the cyanide, thus it is a necessary step in the extraction process.
• The process is called Mac-Arthur Forrest cyanide.
• This is used in the extraction of these metals.
• The leaching process is used to make the water-soluble complexes during the extraction of silver and gold.