Question

Which of the following ions, will have maximum hydration energy?

• A. $\text{CuS}{\text{O}}_{\text{4}}\text{+NaOH(aq)}$
• B. $\text{CuS}{\text{O}}_{\text{4}}+\text{N}{\text{a}}_{\text{2}}\text{C}{\text{O}}_{\text{3}}$
• C. $CH\equiv CH+HBr\to X$
• D. $\text{MgC}{l}_{\text{2}}.\text{CaSi}{\text{O}}_{\text{3}}.\text{2}{\text{H}}_{\text{2}}\text{O}$

Answer 1

Answer: (D)

Hydration energy of smaller cations are higher than those of larger cations, hence $M{g}^{2+}$ has maximum hydration energy among these.