Extraction of Metals from Ores
Chemistry ⇒ Metals and Non-metals
Extraction of Metals from Ores starts at 9 and continues till grade 12.
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Describe the difference between calcination and roasting.
Describe the process of froth flotation used in the concentration of ores.
Describe the role of coke in the extraction of iron from its ore in the blast furnace.
Explain the term 'gangue' in metallurgy.
Explain why carbon cannot be used to reduce aluminium oxide to aluminium.
Explain why gold and platinum are found in a free state in nature.
A sample of iron ore contains 60% Fe2O3. Calculate the mass of pure iron that can be obtained from 100 kg of this ore. (Atomic masses: Fe = 56, O = 16)
Consider the following scenario: A metallurgist is extracting a metal from its oxide ore using hydrogen gas as the reducing agent. The metal obtained is found to be contaminated with hydrogen. Suggest a method to obtain pure metal and explain the principle behind it.
Which of the following is a carbonate ore?
(1) Malachite
(2) Galena
(3) Magnetite
(4) Bauxite
Which of the following is a gangue material commonly associated with iron ore?
(1) Silica
(2) Copper
(3) Sodium
(4) Chlorine
Which of the following is a sulphide ore?
(1) Bauxite
(2) Galena
(3) Hematite
(4) Magnetite
Which of the following is not a method of concentration of ores?
(1) Froth flotation
(2) Magnetic separation
(3) Electrolysis
(4) Gravity separation
Fill in the blank: The chemical formula of bauxite is __________.
Fill in the blank: The extraction of a metal from its ore by heating with a reducing agent is called __________.
Fill in the blank: The process of extracting a metal from its ore and refining it is called __________.
Fill in the blank: The process of extracting silver from argentite involves __________.
State whether the following statement is true or false: 'Electrolytic refining is used to purify metals like copper and zinc.'
State whether the following statement is true or false: 'Froth flotation is used for the concentration of sulphide ores.'
State whether the following statement is true or false: 'Leaching is used for the extraction of gold and silver.'
State whether the following statement is true or false: 'Roasting is used for sulphide ores.'
