JEE Main · 2025 · Shift-IImediumPB12-128

The amphoteric oxide among V2O3, V2O4 and V2O5 upon reaction with alkali leads to formation of an oxide anion. The…

p-Block Elements (Class 12) · Class 12 · JEE Main Previous Year Question

Question

The amphoteric oxide among $\text{V}_2\text{O}_3$ , $\text{V}_2\text{O}_4$ and $\text{V}_2\text{O}_5$ upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is:

(a) $+3$ \quad (b) $+7$ \quad (c) $+5$ \quad (d) $+4$

Options

a
$+3$
b
$+7$
c
$+5$
✓
d
$+4$

Correct Answerc

$+5$

Detailed Solution

Step 1 — Identify amphoteric oxide:

$\text{V}_2\text{O}_5$ is amphoteric; reacts with alkali:

$\text{V}_2\text{O}_5 + 6\text{NaOH} \rightarrow 2\text{Na}_3\text{VO}_4 + 3\text{H}_2\text{O}$

Oxide anion formed: $\text{VO}_4^{3-}$

Step 2 — Oxidation state of V in $\text{VO}_4^{3-}$ :

$x + 4(-2) = -3 \implies x = +5$

Answer: (c) $+5$

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