Which of the following statements is not correct ?

Options

A. Zinc can be extracted from its ore by roasting followed by reduction with coke.
B. In reverberatory furnace , both oxidation and reduction processes can be carrried out.
C. Silver is purifed by distillation or liquation process.
D. Highly pure metals are obtained by zone refining.

Explanation

To solve the question "Which of the following statements is not correct?", we will evaluate each statement provided in the options:

1. **Zinc can be extracted from its ore by roasting followed by reduction with coke.**
- This statement is correct. Zinc is typically extracted from its ore, zinc blende (ZnS), by first roasting it to convert it into zinc oxide (ZnO) and then reducing it with coke (carbon) to obtain zinc metal.

2. **In a reverberatory furnace, both oxidation and reduction processes can be carried out.**
- This statement is also correct. A reverberatory furnace is designed to allow for both oxidation and reduction reactions to occur, making it versatile for various metallurgical processes.

3. **Silver is purified by distillation and liquefaction.**
- This statement is incorrect. Silver has a moderate boiling point and melting point, which means that distillation and liquefaction are not suitable methods for its purification. Instead, silver is typically purified by processes such as electrolysis or cupellation.

4. **Highly pure metals are obtained by zone refining.**
- This statement is correct. Zone refining is a method used to obtain highly pure metals by melting a small region of the material and moving this molten zone along the solid, allowing impurities to be segregated.

After evaluating all the statements, we conclude that the third statement is the one that is not correct.

**Final Answer: The statement that is not correct is: "Silver is purified by distillation and liquefaction."**

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