Tag: study of kerala

Gold because of its inert nature does not combine with oxygen, hydrogen or humidity easily and thus occur in native state or free state.

The most abundant salt of sodium in nature is sodium chloride (NaCl).

(i) Mineral is a naturally occurring substance that is solid and inorganic represented by chemical formula and has ordered structure. Minerals are differentiated based on their physical and chemical properties.
(ii) Ore is a type of rock that contains sufficient minerals with metals which are economically extracted by mining. Metal ores are generally oxides,sulphides,silicates. The ores are processed to extract metals.
(iii) Gangue are the impurities which are mixed closely with the ores. It is unwanted material which is of no market value and it is waste rock or mineral or sand etc.

Impurities like sand,stones and rocky material present with ores are removed by employing various processes either physical or chemical in many steps and these are known as gangue.

To obtain a metal from its ore is called extraction of metal. The various process involved in the extraction of metals from the ores and refining are known as metallurgy.

Ores contain some impurities in the form of clay or rocky material known as gangue.

The process of extracting metals from their ores is called as metalurgy.The process employed in the extraction of the ore depends on the nature of the ore and the impurities present in it.The following are the basic steps for a metallurgical operation;

1. Crushing and grinding of the ore.
2. Concentration of the ore 
3. Working of the ore 
4. Purification or refining of the metal

Metallurgy is the science of extracting metals from their ores and modifying the metals for use. It is a commercial method.

Dolomite is a sedimentary rock. Therefore, the incorrect match is option D