(a) Magnetite is a natural magnet.
- Magnetite can be described as a naturally occurring ore of iron which is attracted to a magnet.
- Magnetite has the properties to become a permanent magnet.
- In fact, studies have shown magnetite to be the most magnetic out of all compounds which are present on the Earth naturally.
- Other options, such as option (c) Bakelite is not correct because Bakelite is a synthetic plastic which will not have magnetic properties.
Hence, the correct option is (a) magnetite.
