Select the incorrect statement (s) amongst the following: (a) \( \mathrm{Cs}^{+} \)is more hydra...

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Select the incorrect statement (s) amongst the following:
(a) \( \mathrm{Cs}^{+} \)is more hydrated than the other alkali metal ions.
(b) Among the alkali metals Li,Na,KandRb, lithium has the highest melting point.
(c) Ionic mobility of \( \mathrm{Li}^{+} \)is maximum among alkali metal cations.
(d) Ionisation potential of \( \mathrm{Li} \) is lower than that of \( \mathrm{Na} \).
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