If you add salt to liquid nitrogen,would it turn into a superconductor?

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I was wondering also if you put a magnet above it, then lifted the magnet up,would the nitrogen and salt come up too?
 
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Unfortunately not. Only a few special materials become superconducting at LN2 temperatures and salt isn't one of them.
In addition superconductors aren't attracted to magnets - they tend to repel magnetic fields.