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Q.

Which of the following is the mineral found in the lodestone at magnesia?


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a

Iron oxide(Fe3O4)

b

Lead oxide

c

Either of them

d

None of these 

answer is A.

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Detailed Solution

The mineral found in the lodestone at magnesia is iron oxide (Fe3O4).
The earliest reference to the attractive properties of lodestone was made in the  6 th century BC by a Greek philosopher. Lodestone is a naturally occurring piece of magnetite. Each piece of this rock behaved as an individual magnet. The reference to lodestone’s attractive properties. It attracted the pieces of iron towards it. When we suspended a piece of magnetite with a thread, it rested in the north-south direction.
   
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