Q. What is the role of depressant in froth floatation process?

Q. Why is zinc not extracted from zinc oxide through reduction using $CO?$

Q. Explain: (i) Zone refining (ii) Column chromatography.

Q. Describe a method for refining nickel.

Q. Name the common elements present in the anode mud in electrolytic refining of copper. Why are they present?

Q. How is leaching carried out in case of low grade copper ores?

Q. Copper can be extracted by hydrometallurgy but not zinc. Explain.

Q. Differentiate between minerals and ores.

Q. What is the role of cryolite in the metallurgy of aluminium?

Q. What criterion is followed for the selection of the stationary phase in chromatography?

Q. Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.

Q. What is meant by the term chromatography?

Q. Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

Q. State the role of silica in the metallurgy of copper.

Q. How is cast iron different from pig iron?

Q. Out of $C$ and $CO$, which is a better reducing agent at $673K$?

Q. Differentiate between roasting and calcination with examples.

Q. How can you separate alumina from silica in a bauxite ore associated with silica? Give equations, if any.

Q. Write chemical reactions taking place in the extraction of zinc from zinc blende.

Q. Why copper matte is put in silica lined converter?