Metallurgy Principles and Processes
Chemistry ⇒ Metals and Non-metals
Metallurgy Principles and Processes starts at 9 and continues till grade 12.
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Describe the principle of electrolytic refining of metals.
Explain the difference between calcination and roasting.
Explain the term 'gangue' in metallurgy.
Explain why carbon cannot be used to reduce aluminium oxide to aluminium.
Explain why sulphide ores are usually converted to oxides before reduction.
In the context of metallurgy, what is meant by 'smelting'?
A metallurgist is considering two possible reducing agents, A and B, for the reduction of a metal oxide MO. The standard Gibbs free energy of formation (ΔG0f) for AO and BO are -400 kJ/mol and -300 kJ/mol, respectively, while for MO it is -350 kJ/mol. Which reducing agent is thermodynamically more suitable for reducing MO to M? Justify your answer.
The extraction of a certain metal involves the following steps: (i) Concentration by froth flotation, (ii) Roasting to form oxide, (iii) Reduction with carbon. Identify the metal and justify your answer.
Which of the following is a basic flux? (1) Silica (2) Limestone (3) Bauxite (4) Alumina
Which of the following is a flux used in the extraction of iron? (1) Silica (2) Limestone (3) Alumina (4) Bauxite
Which of the following is a method of extracting metals from their ores using a chemical solution? (1) Leaching (2) Roasting (3) Smelting (4) Calcination
Which of the following is a method of refining metals? (1) Zone refining (2) Roasting (3) Leaching (4) Froth flotation
In the extraction of iron, the slag formed is ________.
Roasting is carried out in the presence of ________.
The chemical formula of haematite, an ore of iron, is __________.
The process of extracting a metal from its ore and refining it is called __________.
State whether the following statement is true or false: 'Aluminium is extracted from bauxite by electrolytic reduction.'
State whether the following statement is true or false: 'Calcination is the process of heating an ore in the absence of air.'
State whether the following statement is true or false: 'Froth flotation process is used for the concentration of oxide ores.'
State whether the following statement is true or false: 'Gangue is the commercially valuable part of an ore.'
