What is an alloy ?
An alloy is a homogeneous mixture of two or more metals, or a metal and a nonmetal. It is prepared by first melting the primary metal, and then, dissolving the other elements in it in definite proportions. It is then cooled to room temperature. For example, brass, an alloy of copper and zinc (Cu and Zn), and bronze, an …
Similarity between Roasting and Calcination
Roasting Heating ore upto red hot below its Melting point. Removing volatile impurities. Formation of metla oxide Calcination Heating ore upto red hot below its Melting point. Removing volatile impurities. Formation of metla oxide
The wonder of ancient Indian metallurgy
The wonder of ancient Indian metallurgyThe iron pillar near the Qutub Minar in Delhi was built more than 1600 years ago by the iron workers of India. They had developed a process which prevented iron from rusting. For its quality of rust resistance it has been examined by scientists from all parts of the world. …
Some facts of GOLD
Pure gold, known as 24 carat gold, is very soft. It is, therefore, not suitable for making jewellery. It is alloyed with either silver or copper to make it hard. Generally, in India,22 carat gold is used for making ornaments. It means that 22 parts of pure gold is alloyed with 2 parts of either …
CORROSION
CORROSION The following about corrosion –i) Silver articles become black after some time when exposed to air.This is because it reacts with sulphur in the air to form a coating of silver sulphide.ii) Copper reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This …
Refining of Metals
Refining of MetalsThe metals produced by various reduction processes described above are not very pure. They contain impurities, which must be removed to obtain pure metals.The most widely used method for refining impure metals is electrolytic refining.Electrolytic Refining: Many metals, such as copper, zinc, tin, nickel, silver, gold, etc., are refined electrolytically. In this process, …
Extracting Metals towards the Top of the Activity Series
Extracting Metals towards the Top of the Activity SeriesThe metals high up in the reactivity series are very reactive. They cannot be obtained from their compounds by heating with carbon. For example, carbon cannot reduce the oxides of sodium, magnesium, calcium, aluminium, etc., to the respective metals. This is because these metals have more affinity …
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Extracting Metals in the Middle of the Activity Series
Extracting Metals in the Middle of the Activity Series The metals in the middle of the activity series such as iron, zinc, lead, copper, are moderately reactive. These are usually present as sulphides or carbonates in nature. It is easier to obtain a metal from its oxide, as compared to its sulphides and carbonates. Therefore, …
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