Which of the following is most soluble in water? — s Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: The solubility of ionic salts depends on the balance between lattice energy and hydration energy. Step 2: For perchlorates, since the perchlorate anion (ClO4^-) is very large, the lattice energy remains relatively constant down the group. Therefore, solubility is determined primarily by the hydration energy of the cations. Step 3: The Li+ ion is the smallest cation and possesses the highest hydration energy, which easily overcomes the lattice energy, making LiClO4 highly soluble. Thus, option (d) is correct.