Question

Bauxite is purified by:
A.Hall’s process
B.Baeyer’s process
C.Serpeck’s process
D.LD process

Answer 1

Hint:This question gives the knowledge about the separation techniques for the ores. Separation techniques are the techniques which help in separating the impurities from the ores. Separation can be done both physically and chemically.

Complete answer:
Hall’s process is one of the most important and foremost processes used in the industries for smelting of aluminum. And bauxite is an ore of aluminum.
Baeyer’s process is a process used for the refining of bauxite ore for the production of alumina. This process is also used in various industries.
Serpeck’s process is the process of converting bauxite into aluminum nitride. This process is generally used when silica is present in the bauxite ore.
Therefore, Hall’s process, Baeyer’s process and Serpeck’s process are the various processes used for the purification of bauxite.

Hence, options A,B and C are correct.

Note:
Separation techniques are the techniques which help in separating the impurities from the ores. Separation techniques are basically of two types which are as follows:
Physical separation technique
Chemical separation technique
Physical separation techniques are generally based on physical properties of the chemical substances. Various physical properties are specific gravity, boiling point, melting point, solubility, and physical state. For example handpicking, magnetism, solubility and so forth.
Chemical separation techniques are generally based on the chemical interactions among the mixture components. For example chromatography, extraction and so forth.