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) \[\text{MgC}{{l}_{\text{2}}}.\text{CaSi}{{\text{O}}_{\text{3}}}.\text{2}{{\text{H}}_{\text{2}}}\text{O}\]
Correct Answer: D
Solution :
Hydration energy of smaller cations are higher than those of larger cations, hence \[M{{g}^{2+}}\] has maximum hydration energy among these.
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