Question

Which of the following methods are not used to refine any metal?

1. Liquation
2. Calcination
3. Electrolysis
4. Leaching
5. Distillation

Choose the correct answer from the options given below :

• A. B & D only
• B. A, B, D & E only
• C. B, D & E only
• D. A, C & E only

Answer 1

The Correct Option is A

To determine which methods are not used to refine metals, let's analyze each method listed in the options.

1. Liquation: This method is employed to refine metals with low melting points, such as lead or tin. It involves heating the impure metal and allowing the pure metal to separate due to its lower melting point. Hence, it is a refining method.
2. Calcination: This is a process used in the extraction of metals. It involves heating the ore in the absence of air to remove volatile impurities but is not a refining method. Therefore, calcination is not used for refining metals.
3. Electrolysis: This method is widely used for the purification of metals. Metals such as copper, aluminum, and others are refined using this method by passing an electric current through them. Therefore, it is a refining method.
4. Leaching: This is a process of extraction rather than refining. It's used to separate a substance from a solid by dissolving it in a liquid. This method is commonly used in mining operations and not in refining. Thus, leaching is not used for refining metals.
5. Distillation: This method is used for refining volatile metals like zinc and mercury. It involves the evaporation of the metal followed by cooling and condensation. Thus, it is a refining method.

From this analysis, we can conclude that Calcination (B) and Leaching (D) are not used for refining any metals. Therefore, the correct answer is the option B & D only.