JEE Main Chemistry question

The correct order of hydration energy of alkaline earth metal ions is:

(A)Be^{2+}>Mg^{2+}>Ca^{2+}>Sr^{2+}>Ba^{2+}Correct
(B)Ba^{2+}>Be^{2+}>Ca^{2+}>Mg^{2+}>Sr^{2+}
(C)Mg^{2+}>Be^{2+}>Ba^{2+}>Ca^{2+}>Sr^{2+}
(D)None of the above

Answer: (A)

Solution

Hydration energy of a cation increases as its ionic radius decreases. Since ionic radius increases steadily down group 2 (Be^{2+}<Mg^{2+}<Ca^{2+}<Sr^{2+}<Ba^{2+}), hydration energy decreases in the same

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Question ID VK-137961