NEET2020Chemistry-Coordination Compounds
NEET 2020 Chemistry Magnetic Properties MCQ Question
Type: MCQ-conceptual-Easy-Class 12
The calculated spin only magnetic moment of Cr²⁺ ion is :
A
5.92 BM
B
2.84 BM
C
3.87 BM
D
4.90 BM
Correct Answer
Option D
Detailed Explanation
The Cr²⁺ ion has 4 unpaired electrons. The spin-only magnetic moment is calculated using the formula μ = √n(n+2) BM, where n is the number of unpaired electrons. For Cr²⁺, μ = √4(4+2) = √24 = 4.90 BM.
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