HISTORY
ANCIENT INDIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A Medical Emergency
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The study of the refinement and purification of metals
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The study of heavy metal
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The development of a standard currency
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Detailed explanation-1: -Refining is a method of removing impurities in order to obtain metals of high purity. The impurities are removed from crude metal by various methods based on the properties of the metal and the properties of impurities. Some methods involved in the purification of crude metal are: Distillation.
Detailed explanation-2: -The process of extracting metals from their ores is called metallurgy. 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: Crushing and grinding of the ore.
Detailed explanation-3: -In metallurgy, refining consists of purifying an impure metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining, the final material is usually identical chemically to the original one, only it is purer.
Detailed explanation-4: -Metallurgy is a domain of materials science and of materials engineering that studies the physical and chemical behaviour of metallic elements, their intermetallic compounds, and their mixtures, which are called alloys.