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Q.

An ore of iron that acts as a natural magnet is:

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a

Both (A) and (B)         

b

Magnetite

c

Hematite

d

None of the above

answer is B.

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Detailed Solution

Magnetite is a mineral and one of the main iron ores. With the chemical formula

  Fe3O4, it is one of the oxides of iron. Magnetite is ferromagnetic; it is attracted to a magnet

   and can be magnetized to become a permanent magnet itself. It is the most magnetic of all the  naturally-occurring minerals on Earth

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