Which method is not correct for refining of crude metals ?

Options

A. Liquation : tin
B. Zone refining : silicon
C. Electrolytic refining : bliser copper
D. Mond' process : aluminium

Explanation

To determine which method is not correct for refining of crude metals, we can analyze the methods mentioned and their respective applications:

1. **Electrolytic Refining**: This method is commonly used for refining copper. It involves using an electrolytic cell where copper ions are deposited onto a cathode from a solution of copper sulfate.

2. **Joule Refining**: This method is used for refining metals like silicon and germanium, which are semiconductors. It involves heating the metal to a high temperature to separate impurities.

3. **Liquefaction**: This method is suitable for refining low melting point metals such as tin and zinc. It involves melting the metal and allowing impurities to separate based on their melting points.

4. **Mons Process**: This process is specifically used for the purification of nickel. It involves converting nickel into a volatile compound and then decomposing it to obtain pure nickel.

5. **Hoops Process**: This method is used for refining aluminum. It involves the use of chemical reactions to separate aluminum from its ores.

Now, we need to identify the incorrect matching of a refining method with a metal.

- The Mons process is correctly associated with nickel, not aluminum.
- The Hoops process is correctly associated with aluminum.

Thus, the incorrect method for refining crude metals is the association of the Mons process with aluminum.

### Final Answer:
The method that is not correct for refining of crude metals is the association of Mons process with aluminum.

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