Select correct statement regrading silver extraction//purification 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 determine the correct statements regarding the silver extraction and purification process, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Extraction Process**:
- Silver is often extracted from its ores in the form of a lead-silver alloy. The extraction process involves several methods, including the Parkes process and the Pattinson process.

2. **Analyzing Option A**:
- **Statement**: "When lead silver alloy is rich in silver, lead is removed by the circulation process."
- **Evaluation**: This statement is correct. In the circulation process, the lead is removed from the silver-rich alloy, allowing for the purification of silver.

3. **Analyzing Option B**:
- **Statement**: "When lead silver alloy is rich in lead, lead is removed by Parkes or Pattinson process."
- **Evaluation**: This statement is also correct. Both the Parkes process and the Pattinson process are used to separate silver from lead when the alloy is rich in lead.

4. **Analyzing Option C**:
- **Statement**: "Zinc forms an alloy with lead, which lead is separated by distillation. Zinc forms an alloy with silver, from which zinc is separated by distillation."
- **Evaluation**: This statement is partially correct. While zinc does form an alloy with silver, the separation of lead from zinc is not typically done by distillation. Instead, lead is usually separated from zinc by other methods. Therefore, the first part of the statement is misleading.

5. **Analyzing Option D**:
- **Statement**: "Zinc and Lead Ores often occur together and for most extraction methods they have to be separated."
- **Evaluation**: This statement is correct. Zinc and lead ores do commonly occur together, and separation is necessary for effective extraction.

### Conclusion:
- The correct statements regarding the silver extraction/purification process are:
- A: Correct
- B: Correct
- C: Incorrect (due to misleading information about the separation method)
- D: Correct

### Final Answer:
The correct statements are A, B, and D.

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