Question

Which of the following shows an incorrect method of refining?

• A. Zinc : Liquation
• B. Copper : Electrolysis
• C. Titanium : Van Arkel Method
• D. Nickel : Mond’s Process

Answer 1

The Correct Option is A

The question asks which of the given methods of refining is incorrect for the listed metals. Let's analyze each pair to determine the correctness:

1. Zinc : Liquation
   Liquation is a process used to refine metals with low melting points. Zinc, however, does not match this criterion, as its melting point is relatively high. Instead, zinc is commonly refined through a process called "distillation" or "electrolytic refining." Thus, this pairing is incorrect.
2. Copper : Electrolysis
   Copper is refined using electrolysis, a process where impure copper acts as an anode and pure copper deposits at the cathode. This method efficiently removes impurities. Therefore, this method is correctly paired with copper.
3. Titanium : Van Arkel Method
   The Van Arkel method is a refining process used for metals like titanium and zirconium. It involves converting the impure metal to a volatile compound and then decomposing it to get a pure metal. Thus, this method is correctly paired with titanium.
4. Nickel : Mond’s Process
   The Mond process is a method specifically used to refine nickel. It involves converting nickel into a volatile compound, nickel carbonyl, and then decomposing it to obtain pure nickel. Hence, this pairing is correct.

In conclusion, the incorrect method of refining for the listed metals is Zinc : Liquation. Zinc should not be refined using the liquation process. Instead, other more appropriate methods, such as distillation or electrolytic refining, should be used.