Select the incorrect statement(s):....

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Select the incorrect statement(s):
\( \mathrm{P} \)
(1) \( \mathrm{Cs}^{+} \)is more hydrated than the other alkali metal ions
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(2) Among the alkali metals \( \mathrm{Li}, \mathrm{K} \) and \( \mathrm{Rb} \), lithium has the highest melting point
(3) Ionic mobility of \( \mathrm{Li}^{+} \)is maximum among alkali metal cations
(4) Ionisation potential of \( \mathrm{Li} \) is lower than that of \( \mathrm{Na} \)


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