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Question
State three objectives achieved during the roasting of ores.
Solution
- It removes moisture from ores.
- It makes the ore porous and more reactive.
- It expels volatile impurities.
- It converts sulphide ores into oxides.
RELATED QUESTIONS
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
Which of the following pair of metals exists in their native state in nature?
(a) Ag and Hg
(b) Ag and Zn
(c) Au and Hg
(d) Au and Ag
Which metal can be extracted from the following ore?
Haematite
Name the following:
Two metals which are found in the free or native state.
Compare the process of calcination and roasting.
How many valence electrons are present in non- metals?
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
