The d electron configurations of Cr 2+ , Mn 2+ , Fe 2+ and Ni 2+ are 3d 4 , 3d 5 , 3d 6 and 3d 8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (At. No. Cr = 24, Mn =25, Fe =26, Ni =28)

1. A. [Fe(H 2 O) 6 ] 2+
2. B. [Ni(H 2 O) 6 ] 2+
3. C. [Cr(H 2 O) 6 ] 2+
4. D. [Mn(H 2 O) 6 ] 2+

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