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Balanced equation for Oxidation-Reduction reaction for Ho2 + Cr(OH)3 = CrO4 + OH. Please show your work

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I don't know the identity of HO2. The OH needs a minus sign (OH^-). Cr goes from +3 on the left to +6 on the right. I don't see a reduction but it may be the HO2 (could that be H2O2?). Here is a good site that shows you everything you may need to know about redox.
http://www.chemteam.info/Redox/Redox.html
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