Which of the following is amphoteric oxide ?
| 1. | \(V_{2} O_{5} , C r_{2} O_{3}\) | 2. | \(M n_{2} O_{7} , C r O_{3}\) |
| 3. | \(C r O , V_{2} O_{5}\) | 4. | \(V_{2} O_{5} , V_{2} O_{4}\) |
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