The soft iron is a magnetic material hence it became an induced magnet and attracted the blade.
The term magnetic substances is a substance that can be attracted b a magnet. Now we know that the soft iron is a magnetic material hence it became an induced magnet and attracted the blade.
Recall that a magnetic substance is a substance that can be attracted by a magnet. Wood can not be attracted by a magnet but soft iron cash attracted by a magnet hence it is a magnetic substance.
This is not possible in the case of the wooden block since it is not magnetic as such the the razor blade on the wooden block was attracted to the magnet while the other on the soft iron was not.
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