First slide

Electronic configuration and Atomic , physical properties

Question

Consider the following perhalate ions in acidic medium
${ClO}_{4}^{-} (I), {BrO}_{4}^{-} (II), {IO}_{4}^{-} (III)$
Arrange these in the decreasing order of oxidizing power

Moderate

A

I > II > III
B

I > III > II
C

II > I > III
D

II > III > I

Solution

Standard reduction potential (in volts) of the perhalate ions are given as below.
$\begin{array}{l} {ClO}_{4}^{-} + 2 H^{+} + 2 e^{-} \to {ClO}_{3}^{-} + H_{2} O \\ E^{o} = + 1 .19 V \end{array}$
$\begin{array}{l} {BrO}_{4}^{-} + 2 H^{+} + 2 e^{-} \to {BrO}_{3}^{-} + H_{2} O \\ E^{o} = + 1 .74 V \end{array}$
$\begin{array}{l} {IO}_{4}^{-} + 2 H^{+} + 2 e^{-} \to {IO}_{3}^{-} + H_{2} O \\ E^{o} = + 1 .65 V \end{array}$
More the standard reduction potential more is tendency of perhalate ion to undergo reduction and more stronger it will be as an oxidising agent.

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