First slide

Oxides and Oxoanions

Question

Incorrect statement is

Moderate

A

$2 l^{-} + S_{2} O_{8}^{- 2} \to l_{2} + 2 {SO}_{4}^{- 2}$ catalyst is Fe⁺³ and intermediate is Fe⁺²
B

Interstitial compounds are chemically reactive
C

Difference in metallic radii between two metals forming alloy must be lessthan 15%
D

V₂O₅ is amphoteric

Solution

$S_{2} O_{8}^{- 2} + 2 I^{-} \to 2 {SO}_{4}^{- 2} + I_{2}$
Mechanism:
$2 {Fe}^{+ 3} + 2 I^{-} \to 2 {Fe}^{+ 2} + I_{2} 2 {Fe}^{+ 2} + S_{2} O_{8}^{- 2} \to 2 {Fe}^{+ 3} + 2 {SO}_{4}^{- 2}$
In the above reaction moles of Fe⁺³ ions before the reaction and after the reaction remains same, hence Fe⁺³ ion acts as catalyst.
Fe⁺² ion is formed as intermediate. (True)
Interstitial compounds are chemically inert, hence they are using as refractory materials.(False).
Difference between the atomic radii of alloy forming metals must be about 15% (True)
$V_{2} O_{3} and V_{2} O_{4}$ are basic and $V_{2} O_{5}$ is amphoteric oxide(True)

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