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NEET levelSingle correct optionDifficulty 1 of 3ph167

Under standard conditions, chlorine can displace which of the following halogens from aqueous solutions of their sodium salts?

A $Br X_{2}$ and $I X_{2}$ (from NaBr and NaI)
B $F X_{2}$ only (from NaF)
C $F X_{2}$ and $Br X_{2}$
D $I X_{2}$ only

Answer: A

A halogen displaces another from its halide only if its standard reduction potential is higher:

E^{\circ}

is

1.36 V

for

Cl X_{2} / Cl X^{-}

,

1.09 V

for Br and

0.54 V

for I, but

2.87 V

for F. So

Cl X_{2}

liberates

Br X_{2}

and

I X_{2}

but cannot oxidise

F X^{-}

.

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