what transition metal is pale green with the oxidation state of +2 and turns lilac when it has been oxidised (+3 oxidation state)?

Answer 1

Vanadium is the metal 

vanadium forms metal aquo complexes of which the colours are lilac [V(H2O)6]2+, green [V(H2O)6]3+

so your colours are right but the oxidation states are reversed. The lilac is +2 and the pale green oxidation state of vanadium is +3 

Source(s): https://en.wikipedia.org/wiki/Vanadium

Answer 2

tungesten?............

Answer 3

there are no metals that are green.

copper oxide is green, perhaps that is what you want?

Answer 4

The statue of liberty is pale green so I'll say copper .

Answer 5

Sounds like chromium to me.