Tag: in the land of kerala

Metals below carbon in the reactivity series can be extracted using carbon. Carbon reduces the metal oxides that are extracted when heated. 

$MnO + SiO _2 \rightarrow MnSiO _3(Slag)$

Electrolytic reduction method is used for entraction of highly electropositive elements.

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.