Question

The substances, present as impurities in on ore, are called

• A. Slag
• B. Gangue
• C. Mineral
• D. None of these

Hint:

Do not confuse Gangue and Slag. Gangue is the natural impurity in the ore. Slag is the man-made waste product after processing the ore with a flux.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
This question relates to the terminology used in metallurgy, the science of extracting metals from their ores.

Step 2: Detailed Explanation:
\[\begin{array}{rl} \bullet & \text{Ore: A naturally occurring rock or mineral from which a metal or valuable mineral can be profitably extracted. } \\ \bullet & \text{Mineral: A naturally occurring, inorganic solid with a definite chemical composition and a crystalline structure. An ore is a type of mineral. } \\ \bullet & \text{Gangue (or matrix): The commercially worthless material (like sand, rock, clay) that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. These are the impurities that need to be removed. } \\ \bullet & \text{Slag: A glassy, non-metallic byproduct formed during the smelting of an ore. It is formed when a flux is added to react with the gangue, creating a molten substance that can be easily separated from the molten metal. } \\ \end{array}\] Therefore, the impurities present in an ore are called gangue.

Step 3: Final Answer:
The impurities present in an ore are called gangue.