Answer:
(a) Mineral:
The inorganic element or compound which occurs naturally in the earth's crust
is called mineral. For example, copper pyrites (CuFeS2), cuprite (Cu2O),
etc. are the minerals of copper
(b) Ore: The mineral from which a metal can be
extracted profitably and conveniently is called ore. For example. Bauxite (Al2O32H2O)
and Clay (Al2O3.2SiO2.2H2O) are the
minerals of aluminium. But extraction of aluminium is cheaper and easier from
bauxite. Hence, bauxite is the ore of aluminium.
Thus,
"every ore is a mineral but every mineral is not ore."
(c)
Gangue: The unwanted impurities of sand and rocky materials present in the
ore are known as gangue or matrix. We get a concentrated ore by removing the
gangue present in it.
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