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Which ions has exceptionally higher λ values ?

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By Expert Faculty of Sri Chaitanya
a
H+
b
K+
c
OH−
d
NH2−

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detailed solution

Correct option is A

The hydrogen ion, because of its small size has high charge density and is heavily hydrated. Thus, we expect the mobility of H+ ion to be low rather than high.The high mobility of H+ ions is hydroxlytic solvents such as H2O can be explained by Grouttus type meachanism in which a proton moves rapidly from H3O+ to a hydrogen-bonded water molecule and is transferred along a series of hydrogen bonded water molecules by a rearrangement of hydrogen bonds (just like a relay race).Amongest negatives ions, OH- has the highest ionic mobility.
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