The oxidation number of \( \mathrm{Cr} \) is +6 in:....

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The oxidation number of \( \mathrm{Cr} \) is +6 in:
(1) \( \mathrm{FeCr}_{2} \mathrm{O}_{4} \)
\( \mathrm{P} \)
(2) \( \mathrm{KCrO}_{3} \mathrm{Cl} \)
W
(3) \( \mathrm{CrO}_{5} \)
(4) \( \left[\mathrm{Cr}(\mathrm{OH})_{4}\right]^{-} \)


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