First slide

Electronic configuration and Atomic , physical properties

Question

Among halogens, the one which can oxidise water to oxygen is :

Easy

A

chlorine
B

bromine
C

fluorine
D

iodine

Solution

Oxidising Power of $F_{2} > {Cl}_{2} > {Br}_{2} > I_{2}$
SRP Values :
$E_{\frac{1}{2} F_{2} / F^{-}}^{0} (+ 2 .87 V) > E_{\frac{1}{2} {Cl}_{2} / {Cl}^{-}}^{0} (+ 1 .36 V) > E_{\frac{1}{2} {Br}_{2} / {Br}^{-}}^{0} (+ 1 .08 V) > E_{\frac{1}{2} I_{2} / I^{-}}^{0} (+ 0 .54 V)$
$F_{2}$ Oxidizes $H_{2} O to O_{2}$
$F_{2} + H_{2} O \overset{}{\to} 2 HF + O_{2}$

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