Which of the following order is incorrect ? — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Step 1: Check the options against standard periodic trends. In option (b), hydration energy increases with increasing charge and decreasing ionic size, which holds true. In option (d), Ni^4+ has 4 unpaired electrons, V^3+ has 2, and Sr^2+ has 0, making the magnetic moment order correct. Step 2: In aqueous solution, smaller ions like F^- undergo much stronger hydration than larger ions like Cl^-. This extensive hydration shell significantly increases the effective size of the hydrated F^- ion, reducing its mobility and ionic conductance. Step 3: Therefore, the order of electrical conductance of hydrated halide ions should be F^-(aq) < Cl^-(aq). The given order in option (c) is incorrect.