Question
Chemistry Question on Enthalpy change
Which of the following 3d-metal ion will give the lowest enthalpy of hydration (ΔhydH) when dissolved in water?
A
Cr2+
B
Mn2+
C
Fe2+
D
Co2+
Answer
Mn2+
Explanation
Solution
| Δhyd H (M+2)
---|---
Cr| – 1925
Mn| – 1862
Fe| – 1560
Co| – 1640
Mn2+ has the lowest ΔhydH.
So, the correct option is (B): Mn2+.