Chemistry - Metallurgy Question with Solution | TestHub
Refining of crude metal is carried out by physical methods, chemical methods and finally electrolytic refining. chemical methods of refining like oxidation, poling are best explained by Ellingham diagram. Consider following Ellingham diagram and answer following given questions :
Which of the following refining process is/are used to oxidise impurity/ies present in crude metal?
Options:(select one or more)
Answer:
Solution:
The correct options are (B) Steel manufacturing from pig iron and (C) Cupellation of Ag.
Steel manufacturing (B) oxidizes impurities like carbon, silicon, and manganese in pig iron into gaseous or slag oxides.
Cupellation of Ag (C) uses a blast of air to oxidize lead impurities into volatile lead lead oxide (), leaving pure silver behind.
Distillation (A) and Zone refining (D) are physical separation methods based on boiling points and differential solubility, not oxidation.
