નીચે આપેલ પૈકી કઈ $3d$-ધાતુ આયન જ્યારે તેને પાણીમાં ઓગાળવામાં આવે ત્યારે લધુત્તમ જલયોજન એન્થાલ્પી ( $\Delta H _{\text {hyd }}$ ) આપશે.
A$Cr ^{2+}$
B$Mn ^{2+}$
C$Fe ^{2+}$
D$Co ^{2+}$
JEE MAIN 2022, Medium
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b Enthalpy of hydration increases with increase in charge density. \(Mn ^{+2}\) has least charge density (as \(Mn\) has highest size among the given options) so it will have least enthalpy of hydration.
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