First slide

Kohlraush law

Question

Which of the following is arranged in increasing order of ionic mobility ?

Easy

A

$I^{-} < {Br}^{-} < {Cl}^{-} < F^{-}$
B

$F^{-} < {Cl}^{-} < {Br}^{-} < I^{-}$
C

$F^{-} < I^{-} < {Cl}^{-} < {Br}^{-}$
D

$F^{-} < {Cl}^{-} < I^{-} < {Br}^{-}$

Solution

Hydrated size order $F^{-} < {Cl}^{-} < {Br}^{-} < I^{-}$
lonic mobility $α \frac{1}{Hydrated size}$ so Ionic mobility is $F^{-} > {Cl}^{-} > {Br}^{-} > I^{-}$ ^-

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