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 process of froth flotation used in the concentration of ores.
Describe the role of flux in the extraction of metals from ores.
Explain the difference between calcination and roasting.
Explain why carbon cannot be used to reduce aluminium oxide to aluminium.
Explain why sulphide ores are usually converted to oxides before reduction.
Name the process used to extract highly reactive metals like sodium and potassium from their ores.
Name the reducing agent used in the extraction of iron from its ore in a blast furnace.
Which metal is extracted from the ore 'cinnabar'?
In the electrolytic extraction of aluminium, what is used as the electrolyte?
(1) Molten cryolite
(2) Molten alumina
(3) Molten bauxite
(4) Molten haematite
Which of the following is a gangue?
(1) Silica
(2) Iron
(3) Copper
(4) Zinc
Which of the following is not a method of refining metals?
(1) Electrolytic refining
(2) Zone refining
(3) Smelting
(4) Vapour phase refining
Which of the following is not an ore of iron?
(1) Hematite
(2) Magnetite
(3) Bauxite
(4) Siderite
Fill in the blank: The extraction of aluminium from bauxite involves the __________ process.
Fill in the blank: The main ore of aluminium is __________.
Fill in the blank: The ore of zinc is __________.
Fill in the blank: The process of purifying crude metal is called __________.
State whether the following statement is true or false: "All ores are minerals, but all minerals are not ores."
State whether the following statement is true or false: "Electrolytic refining is used to obtain metals of very high purity."
State whether the following statement is true or false: "Gold is usually found in a free state in nature."
State whether the following statement is true or false: "Roasting is carried out in the presence of air."
