The impurities present in a mineral are called — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

# Solution: Impurities in a Mineral **Understanding the terminology:** When mining and extracting metals or minerals, the desired compound is rarely found in pure form. The unwanted materials mixed with the ore are classified by specific names. **Key definitions:** - **Gangue (or Dross):** The worthless/unwanted rocky material and impurities physically mixed with the ore but not chemically bonded. These are separated by physical methods (crushing, washing, magnetic separation, etc.) - **Flux:** A substance intentionally added during smelting to remove impurities by forming fusible compounds - **Slag:** The waste product formed when flux reacts with impurities during smelting—it floats on molten metal and is removed **Why A (Gangue) is correct:** The term **"gangue"** specifically refers to the impurities naturally present in a mineral ore. It consists of worthless minerals (like silica, limestone, or clay) that must be separated before metal extraction. This is the standard definition used in metallurgy and mineral processing. **Example:** In iron ore ($Fe_2O_3$), the gangue might be sand ($SiO_2$) and other silicates that are physically mixed but not chemically combined.