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Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :
Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :
Updated On: Sep 24, 2024
- \([Au(CN)_4]^–\) and \([Zn(CN)_2 (OH)_2]^{2-}\)
- \([Au(CN)_2]^–\) and \([Zn (OH)_4]^{2-}\)
- \([Au(CN)_2]^–\) and \([Zn (CN)_4]^{2-}\)
- \([Au(CN)_4]^{2-}\) and \([Zn (CN)_6]^{4-}\)
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The Correct Option is C
Solution and Explanation
In the metallurgy of gold
\(4Au + 8CN^– + 2H_2O + O_2 → 4[Au(CN)_2]^– + 4OH^–\)
\(2[Au(CN)_2]^– + Zn → [Zn(CN)_4]^{2–} + 2Au\)
So, the correct option is (C): \([Au(CN)_2]^–\) and \([Zn (CN)_4]^{2-}\)
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Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal
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