Tag: study of kerala

Silver is found in nature both in native and combined state. Silver is less reactive than other metals.  Native silver occurs as elongated dendritic coatings or irregular masses.  It may occur alloyed with gold as electrum. It often occurs with silver sulfide and sulfosalt minerals.

Aluminum is the most abundant metal in the earth's crust but it is never found free in nature. Silicon is not a metal.

Silicon is the most abundant element in the earth crust. It is found in rocks .

The impurities present in the ore is known as gangue. The removal of impurities from the ore is known as concentartion of ore.

In smelting, a flux is added to react with non-fusible gangue to form a fusible product called slag.

The process of extraction, purification and refining of metals from ore is called metallurgy.

RCC is Reinforced concrete cement. It is a combination of concrete and steel to build a structure instead of using only concrete. Concrete is good in resisting compression and to gain resisting tension steel is added which has high tensile strength. To overcome the drawback of concrete, reinforced steel bars are used along with concrete.

Aluminium is the most abundant element in the earth's crust. It is most abundant in terms of quantity.

A noble metal is any metal that is found in its metallic form, either pure or alloyed, in nature. Over geological time scales, very few metals can resist natural weathering processes like oxidation, which is why generally only the less reactive metals such as gold and platinum are found as noble metals.