Question

Which of the following oxides are amphoteric?
Mn₂O₇, CrO₃, Cr₂O₃, CrO, V₂O₅, V₂O₄
(a) V₂O₅, Cr₂O₃ (b) Mn₂O₇, CrO₃
(c) CrO, V₂O₅ (d) V₂O₅, V₂O₄

Answer 1

Which of the following oxides are amphoteric?

Mn₂O₇, CrO₃, Cr₂O₃, CrO, V₂O₅, V₂O₄

(a) V₂O₅, Cr₂O₃

(b) Mn₂O₇, CrO₃

(c) CrO, V₂O₅

(d) V₂O₅, V₂O₄

Answer 2

The Oxides (a) V₂O₅, Cr₂O₃ are amphoteric in nature as :

1. V₂O₅ dissolve in acid as well as base so it is amphoteric in nature.

2. Cr₂O₃ can go to its lower oxidation state as well as higher oxidation state. Hence it is also amphoteric in nature.

1. Mn₂O₇, CrO₃ are acidic in nature.

2. CrO is basic in nature.