Which of the following compound has oxidation state of metal atom greater than 4 ? (a) \( \mathr...

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Which of the following compound has oxidation state of metal atom greater than 4 ?
(a) \( \mathrm{K}_{2} \mathrm{MnO}_{4} \)
(b) \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \)
(c) \( \mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
(d) \( \mathrm{K}_{3}\left[\mathrm{Co}(\mathrm{CN})_{6}\right] \)
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