Which metal doesn't dissolve in any acid?

Question

Which metal doesn't dissolve in any acid?

Answer 1

The most resistant are probably platinum and gold, but they will yield to mixture of nitric and hydrochloric acids slowly.

Answer 2

Tin dissolves in acid just fine.  Gold and platinum will dissolve in aqua regia, but some platinum group metals will not.  Osmium and iridium are two such metals; iridium is known to only dissolve in molten sodium or potassium cyanide.

Tantalum is also very corrosion resistant - it is only attacked by hydrofluoric acid and molten alkalis.

Answer 3

Tin will never dissolve but merely burn as if it were scorched by a flame.