The decreasing order of hydration enthalpies of earth metal ions is

Options

A. `Be^(2+) gt Ba^(2+) gt Ca^(2+) gt Sr^(2+)`
B. `Ba^(2+) gt Sr^(2+) gt Ca^(2+) gt Mg^(2+) gt Be^(2+)`
C. `Be^(2+) gt Ca^(2+) gt Mg^(2+) gt Ba(2+)`
D. `Be^(2+) gt Mg^(2+) gt Ca^(2+) Sr^(2+) gt Ba^(2+)`

Answer

D

Explanation

As the sizes increases, hydration enthalpy decress .
` Ba^(2+) gt Mg^(2+) gt Ca^(2+) gt Sr^(2+) gt Ba^(2+)`