Chemistry - Complete d-block Question with Solution | TestHub

(A) V₂O₅ is amphoteric; it reacts with acids and bases forming VO₂⁺ and VO₄³⁻ ions respectively.

(B) CrO₃ is a strong acidic oxide and forms acids like H₂CrO₄ and H₂Cr₂O₇ in water.

(C) Mn₂O₇ is a highly acidic oxide, covalent in nature, and appears as a green oily liquid at room temperature.

(D) CrO is basic (low oxidation state), while Cr₂O₃ is amphoteric.

General trend: Higher oxidation state → more acidic oxide.

Lower oxidation state → more basic oxide.

Intermediate oxidation state → amphoteric behavior.