The amphoteric oxide among and , upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is:??[2025]

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Solution

Q.
The amphoteric oxide among $V_{2} O_{3}, V_{2} O_{4}$ and $V_{2} O_{5}$ , upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is: [2025]

1 +4

2 +7

3 +3

4 +5

Ans.
(4)

$V_{2} O_{3}$ – basic, $V_{2} O_{4}$ – less basic, $V_{2} O_{5}$ – amphoteric. $V_{2} O_{5}$ reacts with alkalies as well as acids to give ${VO}_{4}^{3 -}$ and ${VO}_{4}^{+}$ respectively. Oxidation number of V in ${VO}_{4}^{3 -}$ is +5.

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