Question

Which of the following process is used for the purification of crude metal?

• A. Roasting
• B. Poling
• C. Calcination
• D. Froth flotation

Answer 1

The Correct Option is B

To solve the problem, we need to identify the process used for the purification of crude metal.

1. Understanding the Processes:

- Roasting is the process of heating an ore in the presence of oxygen, typically used to convert ores into oxides before extraction, not primarily for purification.
- Poling is a process used in metallurgy to remove impurities from molten metals, particularly in the refining of copper.
- Calcination is the process of heating ores to high temperatures in the absence of air to remove volatile components, but it is not used for purifying metals.
- Froth flotation is a process used for the purification of ores, especially those with different densities, by separating the valuable mineral from the gangue (impurities).

Final Answer:
The process used for the purification of crude metal is Poling (Option B).