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| $I$ | $II$ |
|---|---|
| $(a). [Cr(H_2O)_6]^{2+}$ | $[Cr(H_2O)_6]^{3+}$ |
| $(b). [Fe(H_2O)_6]^{3+}$ | $[Fe(CN)_6]^{3-}$ |
| $(c). [Fe(CN)_6]^{3-}$ | $[Ru(CN)_6]^{3-}$ |
| $(d). [NiF_6]^{4-}$ | $[NiF_6]^{2-}$ |
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