Can you explain the answer of this question below:The metal extracted by leaching with cyanide is : [aieee-2002]A:MgB:AgC:CuD:NaThe answer is B.

Question

Can you explain the answer of this question below:The metal extracted by leaching with cyanide is :   [aieee-2002]A:MgB:AgC:CuD:NaThe answer is B.

Answer

Leaching and cyanide is done for elements like Ag, Au , etc In NCERT it is given in brief

Answer

The correct answer is option B
The metal extracted by leaching with a cyanide is silver.
The reactions involved in the process are shown below.
Ag₂S + 4NaCN ⇌ 2Na[Ag(CN)₂] + Na₂S
2Na[Ag(CN)₂]+ Zn → Na₂[Zn(CN)₄] + 2Ag↓

Answer

Leaching with cyanide is a common method used for extracting silver (Ag) from its ore. This process is known as cyanide leaching or cyanidation. Let's understand the process in detail:

1. Cyanide Leaching:
- Cyanide is a highly toxic chemical compound that forms a strong complex with silver ions.
- In cyanide leaching, crushed ore is treated with a weak cyanide solution, usually sodium cyanide (NaCN), to form a soluble complex.
- The silver ions in the ore react with the cyanide to form a soluble silver cyanide complex: Ag + 2CN- -> Ag(CN)2-
- This complex can then be easily separated from the rest of the ore.

2. Advantages of Cyanide Leaching:
- Cyanide leaching is widely used for silver extraction due to its effectiveness and efficiency.
- It allows for the extraction of silver from low-grade ores or ores containing only trace amounts of silver.
- The process is relatively simple and can be easily scaled up for commercial production.
- Cyanide leaching also has a high selectivity for silver, meaning it mainly targets and extracts silver from the ore.

3. Alternative Methods:
- While cyanide leaching is commonly used for silver extraction, there are also alternative methods available.
- These include smelting, flotation, and gravity concentration techniques.
- However, these methods may be less efficient or more complex compared to cyanide leaching.

4. Environmental Concerns:
- Cyanide is a highly toxic substance and poses significant environmental risks if not handled properly.
- Strict safety measures and regulations are in place to ensure the safe use and disposal of cyanide in mining operations.
- The use of cyanide in mining has raised concerns regarding its potential impact on water resources and ecosystems.
- Efforts are being made to develop safer and more environmentally friendly alternatives to cyanide leaching.

In conclusion, the metal extracted by leaching with cyanide is silver (Ag). Cyanide leaching is a commonly used method for the extraction of silver from its ore due to its effectiveness and efficiency. However, it is important to ensure proper safety measures and environmental regulations when using cyanide in mining operations.

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