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Which of the following is amphoteric oxide?
P
\( \mathrm{Mn}_{2} \mathrm{O}_{7}, \mathrm{CrO}_{3}, \mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{CrO}, \mathrm{V}_{2} \mathrm{O}_{5}, \mathrm{~V}_{2} \mathrm{O}_{4} \)
W
(i) \( \quad \mathrm{V}_{2} \mathrm{O}_{5}, \mathrm{Cr}_{2} \mathrm{O}_{3} \)
(ii) \( \mathrm{Mn}_{2} \mathrm{O}_{7}, \mathrm{CrO}_{3} \)
(iii) \( \mathrm{CrO}, \mathrm{V}_{2} \mathrm{O}_{5} \)
(iv) \( \quad \mathrm{V}_{2} \mathrm{O}_{5}, \mathrm{~V}_{2} \mathrm{O}_{4} \)
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