# Which occurs in nature in free state

$(a)\;Fe\qquad(b)\;Ni\qquad(c)\;Co\qquad(d)\;Pt$

Platinum is the metal which can be found in free state, because It is not reactive in normal conditions with air, water and other chemicals
Because Pt is a noble metal.
Hence (d) is the correct answer.
edited Nov 18, 2017