Question
What is the value of spin only magnetic moment for Cu ^ 2+ in BM?
MHT CET
Chemistry
d and f Block Elements
2026
MHT CET 2026 (15 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 2.84
- B. 3.87
- C. 1.73
- D. 0.0
Answer
C. 1.73
Step-by-step solution
The atomic number of Cu is 29. The electronic configuration of Cu is [ Ar ] 3d^ 10 4s^ 1 . The electronic configuration of Cu ^ 2+ is [ Ar ] 3d^ 9 . The number of unpaired electrons in Cu ^ 2+ is n = 1. The spin only magnetic moment is given by = n(n+2) BM . Substituting n = 1, we get = 1(1+2) = 3 1.73 BM . Answer: 1.73
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