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.
Describe the role of limestone in the extraction of iron from its ore in the blast furnace.
Explain the term 'smelting'.
Explain why aluminium cannot be extracted from its ore by reduction with carbon.
Explain why gold and platinum are found in a free state in nature.
Explain why metals like sodium and potassium are extracted by electrolysis and not by chemical reduction.
Name one metal that is extracted by reduction with aluminium.
A student is given a sample of an ore containing both magnetic and non-magnetic impurities. Which method should be used to concentrate the ore, and why?
Which of the following is a flux used in the extraction of iron?
(1) Limestone
(2) Sand
(3) Coke
(4) Clay
Which of the following is a gangue?
(1) Iron
(2) Sand
(3) Copper
(4) Aluminium
Which of the following is a method of refining metals?
(1) Roasting
(2) Electrolytic refining
(3) Smelting
(4) Calcination
Which of the following is a sulphide ore?
(1) Bauxite
(2) Galena
(3) Magnetite
(4) Limonite
Fill in the blank: The chemical formula of haematite is __________.
Fill in the blank: The extraction of copper from copper pyrites involves the process of __________.
Fill in the blank: The main ore of iron is __________.
Fill in the blank: The ore of aluminium is called __________.
Is the following statement true or false? 'Gold is found in a free state in nature.'
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: 'Electrolysis is used to extract metals that are more reactive than carbon.'
State whether the following statement is true or false: 'Electrolytic refining is used to purify copper.'
