Question

The correct order of increasing hydration energy of the following ions is

(a) Fe²⁺ < Co²⁺ < Fe³⁺ < AI³⁺

(b) Fe²⁺ < Co²⁺ < Al³⁺ < Fe³⁺

(c) Al²⁺ < Fe²⁺ < Co³⁺ < Fe³⁺

(d) Fe²⁺ < Al²⁺ < Co³⁺ < Fe³⁺

Answer 1

Correct Option (b) Fe²⁺ < Co²⁺ < Al³⁺ < Fe³⁺

Explanation:

Hydration energy increases with increase of charge to size ratio of the ion. Thus, increasing order of hydration energy is

Fe²⁺ < Co²⁺ < Al³⁺ < Fe³⁺