Select correct statement regarding silver extraction process .

Options

A. When the lead-silver alloy is rich in silver, lead is removed by the curpellation process
B. When the lead-silver alloy is ich in lead, lead is removed by parke's or pattinson's process
C. Zinc forms an alloy with lead, from which lead is separated by distillation
D. Zinc forms an alloy with silver, from which zinc is separated by distillation

Answer

To solve the question regarding the correct statement about the silver extraction process, we will analyze each option provided in the video transcript.

### Step-by-Step Solution:

1. **Understanding the Extraction Process:**
The extraction of silver typically involves the processing of lead-silver alloys. The two main processes mentioned are cupellation and the Pattinson process.

2. **Analyzing Statement A:**
- **Statement A:** "When the lead-silver alloy is rich in silver, lead is removed by the cupellation process."
- **Evaluation:** This statement is correct. In cupellation, the lead-silver alloy is heated, and lead is oxidized and removed, leaving behind pure silver.

3. **Analyzing Statement B:**
- **Statement B:** "When the lead-silver alloy is rich in lead, lead is removed by PAX or Pattinson process."
- **Evaluation:** This statement is partially correct. The Pattinson process is used for desilverization of lead, but it is not specifically referred to as PAX. The process involves repeated melting and skimming to concentrate silver.

4. **Analyzing Statement C:**
- **Statement C:** "Zinc forms an alloy with lead from which lead is separated by distillation. Zinc forms an alloy with silver from which zinc is separated by distillation."
- **Evaluation:** This statement is incorrect. While zinc can be used in the extraction of silver, it does not form an alloy with lead for the purpose of separation by distillation. Instead, zinc is used to remove silver from the lead-silver alloy.

5. **Conclusion:**
After analyzing the statements, the correct statement regarding the silver extraction process is:
- **Correct Statement:** "When the lead-silver alloy is rich in silver, lead is removed by the cupellation process."

### Final Answer:
The correct statement regarding silver extraction is: **"When the lead-silver alloy is rich in silver, lead is removed by the cupellation process."**