Step 1: Understanding Amphoteric Behavior of Vanadium Oxide
Vanadium pentoxide (\( V_2O_5 \)) is amphoteric, meaning it reacts with both acids and bases.
Step 2: Oxoions Formation
- In alkali (\( NaOH \)), vanadium forms vanadate ions \( VO_4^{3-} \) with oxidation state +5.
- In acid (\( H^+ \)), vanadium forms vanadyl ions \( VO_2^+ \), also with oxidation state +5.
Conclusion
Thus, the correct answer is:
\[
+5, +5
\]