NCERT Solution for Class Tenth Science Chapter 3
Metals and Non-metals
CBSE NCERT Book Session-2022-2023
Intext Questions
Page No-53
Questions No-1
(i) Mineral (ii) Ore (iii) Gangue
Define the following terms.
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(i) Mineral The elements or compounds, which occur naturally in the earth’s crust, are known as minerals.
(ii) Ore
If minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores.
(iii) Gangue
Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., called gangue.
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(i) Mineral: Minerals are the substances that are rich in particular metals and their composition is fixed.
(ii) Ore: Minerals from which particular metals can be extracted profitably are known as ores.
(iii) Gangue: The impurities like sand, silt, soil, gravel, etc. present in the ore are called gangue.
(i) Mineral:
A mineral is a naturally occurring inorganic solid with a defined chemical composition and a crystalline structure. Minerals are the building blocks of rocks and are characterized by specific physical properties, such as hardness, color, luster, cleavage, and density. They can be composed of one or more elements and are formed through geological processes over long periods of time.
(ii) Ore:
An ore is a naturally occurring rock or mineral from which a valuable substance, usually a metal or an element, can be extracted economically. Ores typically contain high concentrations of the desired material, making their extraction and processing financially feasible. The extraction of metals from ores often involves various processes such as mining, milling, and smelting to obtain the final product in a usable form.
(iii) Gangue:
Gangue refers to the commercially valueless material that surrounds, accompanies, or is closely mixed with the ore in a mineral deposit. While the ore contains the desired substance (e.g., metal), gangue consists of minerals and rocks that have little or no economic value. During the extraction of metals from ores, gangue is usually separated from the ore and discarded, as it does not contribute to the production of the desired metal and may interfere with the extraction process.