Which of the following methods are not used to refine any metal?
- Liquation
- Calcination
- Electrolysis
- Leaching
- Distillation
Choose the correct answer from the options given below :
- Liquation
- Calcination
- Electrolysis
- Leaching
- Distillation
- B & D only
- A, B, D & E only
- B, D & E only
- A, C & E only
The Correct Option is A
Solution and Explanation
The question asks which methods are not used to refine any metal. We need to examine each method listed:
- Liquation: This is a refining process typically used for metals that have low melting points. Impure metal is heated until the impure components melt away. Thus, this method can be used for refining.
- Calcination: This involves heating an ore in the absence of air. It's primarily used in the process of extracting a metal from its ore, not refining. Therefore, it is not used for refining metals.
- Electrolysis: An effective method used for the purification of metals, such as copper. Therefore, it is indeed used for refining metals.
- Leaching: This process involves dissolving the desired metals in a solvent to separate them from impurities, typically used in ore extraction. It is not a refining process.
- Distillation: Used to purify metals that have low boiling points by vaporizing the metal and then condensing it. Thus, this is used for refining certain metals.
Based on the above analysis, the methods not used for refining metals are Calcination (B) and Leaching (D).
Therefore, the correct answer is B & D only.
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Concepts Used:
Occurrence of metals
The existence of metals often plays an important role in our survival, even if we are unaware of them. Our reliance on metals has been strong since the old industrial era. From buildings to jewelry, we utilize them for everything. But where do we acquire these metals from and how are they made? Let's read the occurrence of metal in more detail.
Metals are found in the earth's crust, and it seems to be a good place to extract them through various processes such as metallurgy. The process of extracting metals from ores is called metallurgy. Mining is the most common method of extracting metals from the earth.
In nature, metals are mostly found in mixed conditions. However, they can also be found in a free state. In its natural state, a native metal is one that can be found in its pure form or as part of an alloy. Most metals are exposed to natural processes such as oxidation and corrosion. As a result, only non-reactive metals such as gold, silver, platinum, and others are discovered in their native or open-free condition. Most metals are obtained as compounds, which must be filtered to remove contaminants before being employed in numerous applications.