Discussion
The EPR spectra of [Mn(H2O)6]2+ (55Mn=I=5/2) with zero field splitting show five set of lines. Each set further consist of ........... ...hyperfine lines (At. No. Mn = 25)
Answer: B
Each set consists of 6 hyperfine lines.
High-spin Mn2+ is d5 with S = 5/2. Zero-field splitting separates its six MS levels into Kramers doublets, and the allowed ΔMS = 1 transitions give five fine-structure lines. Each line is split by coupling to the 55Mn nucleus, I = 5/2, into
\[ 2I + 1 = 2 \times \frac{5}{2} + 1 = 6 \]
lines, giving the familiar six-line Mn2+ pattern. Thirty is the total number of lines (5 × 6), not the number in each set, and 5 is the number of fine-structure sets.
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