Out of the following how may oxides are amphoteric in nature Mno,Mn2o Mno2,Cro3 Mn2o7 v2o5

To determine the number of oxides that are amphoteric in nature, we need to understand what amphoteric means. Amphoteric oxides are those that can act as both acidic and basic compounds.

Let's analyze each oxide mentioned in the question:

1. Mno: This is manganese(II) oxide. It is not amphoteric because it only acts as a base.

2. Mn2o: This is also manganese(II) oxide. Similar to Mno, it is not amphoteric and only acts as a base.

3. Mno2: This is manganese(IV) oxide. It is amphoteric because it can act as both an acid and a base.

4. Cro3: This is chromium(VI) oxide. It is not amphoteric and acts as an acid.

5. Mn2o7: This is manganese(VII) oxide. It is not amphoteric and acts as an acid.

6. V2o5: This is vanadium(V) oxide. It is not amphoteric and acts as an acid.

Therefore, out of the given oxides, only Mno2 is amphoteric in nature.