Discussion
In the EPR spectrum of an aqueous solution of VOSO4 at room temperature, the total number of hyperfine splitting signals is
Answer: D
The EPR spectrum shows 8 hyperfine lines.
VO2+ contains V(IV), d1, with one unpaired electron. Vanadium-51, nearly 100 percent abundant, has nuclear spin I = 7/2, and the electron couples to it to give 2I + 1 lines:
\[ 2\left(\tfrac{7}{2}\right) + 1 = 8 \]
In solution at room temperature the anisotropy averages out and the eight-line pattern of the vanadyl ion is seen. 3 and 5 would correspond to nuclei with I = 1 or 2, and 7 to I = 3.
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