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Madhumathy posted an Question
August 24, 2020 • 23:54 pm 30 points
  • IIT JAM
  • Chemistry (CY)

How does mobility of ion changes with size?

on comparing the first group elements for their ionic conductance and mobility. li+ is the most hydrated ion and Cs+ becomes the least. therefore the conductance/mobility decreases down the group. but it is given that li+ has the highest mobility! kindly explain me this sir🙏🏾

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  • Unni

    Li+ is having the least mobility since it is hydrated to a very larger extend.

  • comment-profile-img>
    Dinesh khalmaniya 1

    yes, Li + has the smallest size while Rb+ has the largest size. small is the size, high is the aquation of ion. so Li+(aq.) size will be high in polar solvents. while Rb+(aq.) size will be smaller.and we know that large the size of ion, less is the mobility and hence conductivity will be low

    eduncle-logo-app

    here order is given wrong. please correct it

  • Madhumathy

    yes sir.. thats what i said.but the order given there seems to be different. i.e, in reverse

    eduncle-logo-app

    yes here it is given wrong

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    Priyanshu kumar best-answer

    Lesser is the size....more is hydration of the ion which can't move freely...so becomes less mobile

    eduncle-logo-app

    More mobility of ion means more freely it moves

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