Extraction of Metals and Corrosion

What is the name of the mineral which contains Aluminium?

(a)  

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?

(a)  

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