Metallurgy

ORE used in the extraction of aluminum

• Zinc blende

• Hematite

• Bauxite

Process which involves reduction of metallic oxide to it's metal

• Hall heroult's process

• Hoope's process

• Baeyer's process

• Electrolysis

What is Baeyers process??

• Conversion of impure bauxite to pure alumina using conc. NaOH soln.

• Conversion of pure alumina to pure aluminum

Products formed at cathode during reduction of metallic oxide to it's metal

• Oxygen gas

• Carbon monoxide

• Pure aluminum metal

• Carbon dioxide

A compound added to lower the fusion temperature of the electrolytic bath in the extraction of aluminum (name).

• Cryolite

• NaOH soln.

• Bauxite

• Hematite

Which solution is used to react with bauxite as a first step in obtaining pure aluminum oxide

• Conc. H2SO4 soln.

• Dil. NaOH soln.

• Conc. HCl

• Conc. NaOH soln.

Electrolyte used in Hall Heroult's process

• CuSO4 soln.

• Mixture of fused alumina, cryolite and fluorspar

• Molten lead bromide

• Acidified water

Haematite is the chief ore of aluminum

• True

• False

Process in which about 99.9% pure aluminum is obtained

• Hoope's process

• Electrolysis

• Metallurgy

Precipitated aluminum hydroxide is ignited during Baeyer's process to give

• Pure alumina

• Aluminium

• Oxygen

• Carbon monoxide