Question

Which metal does not react with anything

Answer 1

Gold, silver, and copper do not react with weak acids. Gold is very unreactive but reactive with very specific acids. That is also true of silver and copper. Platinum behaves much like gold, aqua regia being the acid it is most reactive with. Certain acids, like strong hydrofluoric acid, is very reactive with most metals.

So we can't say that a metal does not react with anything

Generally gold and platinum are less reactive