Question: In which of the following pairs, the first oxide is amphoteric and second oxide is basic?
A V2O3, V2O5
B SO2, Mn2O7
C Cr2O3, Cro
D CrO3, Cr2O3
Answer: Cr2O3, Cro
| Property | Acidic Oxides | Basic Oxides | Amphoteric Oxides |
| Introduction | Oxides that produce acidic solutions when dissolved in water. | Oxides that produce basic (alkaline) solutions when dissolved in water. | Oxides that can act as acid as well as basic depending on the conditions. |
| pH in Water | Produce solutions with a pH less than 7. | Produce solutions with a pH greater than 7. | Solutions can have a pH that based on the environment. |
|
Examples |
· SO2
· NO2 · CO2 · CrO3 |
· Na2O
· MgO · Cro |
· Al2O3
· ZnO · Cr2O3 |
| Common Use | Often found in environmental pollutants, contribute to acid rain. | Used in the manufacturing of basic solutions, like in cement production. | Found in ceramics, some metal oxides and are used as abrasives, refractories, and catalysts. |