Question

Mobility of ions Li⁺ , Na⁺ , K⁺ , Ag⁺ in water at 298 K follows the order

• A. K⁺< Ag⁺< Na⁺< Li⁺
• B. Li⁺< K⁺< Na⁺< Ag⁺
• C. Ag⁺< Li⁺<K⁺<Na⁺
• D. Li⁺< Na⁺< Ag⁺< K⁺

Answer 1

The Correct Option is D

• The mobility of ions in water is influenced by their size and hydration energy. Smaller ions tend to have higher mobility because they can move more easily through the solvent.
• Li⁺ is the smallest ion in this group and has the highest hydration energy, which reduces its mobility.
• K⁺ has the largest ionic radius and, thus, the lowest mobility among these ions.

Thus, the correct order of mobility is:

\(Li^+ < Na^+ < Ag^+ < K^+\)

Therefore, the correct answer is (D)