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The pair of the compounds in which both the metals are in the highest possible oxidation state is,
(1) \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-},\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-} \)
(2) \( \mathrm{CrO}_{2} \mathrm{Cl}_{2}, \mathrm{MnO}_{4}^{-} \)
\( \mathrm{P} \)
(3) \( \mathrm{TiO}_{2}, \mathrm{MnO}_{2} \)
(4) \( \left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}, \mathrm{Mn}_{2} \mathrm{O}_{7} \)
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