Extraction of Metals and Corrosion

What is the name of the mineral which contains Aluminium?

What is the name of the process in which pure metal is obtained from ore?

• Filtration

• Oxidation

• Corrosion

• Extraction

When extracting Iron from iron ore, Iron(III) oxide is reduced to iron in the process. What is the reducing agent in that reaction?

• Graphite

• Limestone

• CO2 gas

• Iron oxide

Which of these following metals can be obtained from their ore using coke in the metal-extracting facility?

• Zn

• Al

• Na

• Mg

In Hall-Heroult process, cryolite is added to the molten ore in order to produce Aluminium metal. What is the main reason we use cryolite?

• To lower the melting point of the mixture

• To obtain more Aluminium

• To separate the impurities

• To make the molten electrolyte more conductive

Which if the following option is NOT the reason we use graphite as electrode in metal electrolysis?

• It can conduct electricity well

• It can react with impurities inside metal ore

• It has high melting point

• It is inert

Which of the following methods is a chemical method to prevent rust?

• Painting

• Greasing

• Plastic coating

• Sacrificial metal

What is the name of the device used in the metal extraction?

Which of these metals can be used as sacrificial metal for Iron?

• Aluminium

• Gold

• Silver

• Mercury

What is the name of the process in which a metal is coated with another metal by electrolysis?

• Electrocoating

• Electroplating

• Electroanalysis

• Electrostamping