The enthalpies of hydration of Ca2+, Mn2+, Zn2+ follows the order: A. Mn2+ > Ca2+ > Zn2+ B. Zn2+ > Ca2+ > Mn2+ C. Mn2+ > Zn2+ > Ca2+ D. Zn2+ > Mn2+ > Ca2+ Ans- D
+Riya Mehta CFSE is zero in all the cases. That's why it can be answered on the basis of size of cation. Smaller the size, greater the hydration energy. From left to right in a period, size decreases. I hope now you understood