Which of the following ions has the maximum hyration enthalpy?

Options

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

Answer

A

Explanation

Like alkali metal ions,the hydration enthalpies of alkaline earth metal ions decrease withh increase in ionic size down te group:
`Be^(2+) gt Mg^(2+) gt Ca^(2+) gt Sr^(2+) gt Ba^(2+)`