OnlineCBT
Chemistry · PYQ NEET UG 2020
हिन्दीThe calculated spin only magnetic moment of \( \text{Cr}^{2+} \) ion is _______.
Correct answer · Option 1
4.90 BM
Explanation
\( \text{Cr}^{2+} \) has electronic configuration \( [\text{Ar}] 3d^4 \) with 4 unpaired electrons. Magnetic moment \( \mu = \sqrt{n(n+2)} = \sqrt{4(6)} = \sqrt{24} \approx 4.90 \text{ BM} \).
