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  • The correct orders of hydration enthalpies of alkali metal ions is-Option: 1 <img alt="\mathrm{Li}+>\mathrm{Na}^{+}>\mathrm{K}^{+}" src="https:

The correct orders of hydration enthalpies of alkali metal ions is-

Option: 1

\mathrm{Li}+>\mathrm{Na}^{+}>\mathrm{K}^{+}


Option: 2

\mathrm{Na}^{+}>\mathrm{Li}^{+}>\mathrm{K}^{+}


Option: 3

\mathrm{Na}^{+}>\mathrm{Li}^{+}>\mathrm{k}^{+}


Option: 4

\mathrm{Li}^{+}>\mathrm{Na}^{+}<\mathrm{k}^{+}


Answers (1)

best_answer

\mathrm{Li^{+}} possesses the maximun degree of hydration due to its small size. As a consequence of hydration enthalpy, theirs mobility also get affected. \mathrm{\mathrm{Cs}^{+}} has highest and \mathrm{Li}^{+} has lowest mobility in aqueous solution .

The correct order is

\mathrm{Li}+>\mathrm{Na}^{+}>\mathrm{K}^{+}> \mathrm{Rb^{+}}> \mathrm{Cs^{+}}

Hence option 1 is correct.

 

Posted by

Kuldeep Maurya

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