JEE Main 2025 Chemistry question
The metal ions that have the calculated spin only magnetic moment value of 4.9 B.M. are A. Cr²⁺ B. Fe²⁺ C. Fe³⁺ D. Co²⁺ E. Mn³⁺ Choose the correct answer from the options given below:
Answer: (2)
Solution
μ=4.9 BM corresponds to n=4 unpaired electrons, which occurs for Cr²⁺, Fe²⁺, and Mn³⁺.