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Which of the following 3 \! \mathrm{~d}-metal ion will give the lowest enthalpy of hydration \mathrm{\left(\Delta_{\mathrm{hyd}} \mathrm{H}\right)} when dissolved in water ?

Option: 1

\mathrm{Cr}^{2+}


Option: 2

\mathrm{Mn}^{2+}


Option: 3

\mathrm{Fe}^{2+}


Option: 4

\mathrm{Co}^{2+}


Answers (1)

best_answer

Water act as a weak ligand.\mathrm{C\,F\,S\,E} of metal ions depend on strength of ligand.



                                              
Since the \mathrm{C\, F\, S\, E} of  \mathrm{Mn^{2+}} is the least , \mathrm{\Delta H_{Hyd}} of it is also lowest.

Hence option (B) is correct.
 

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