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91. The oxidation number of chromium in the Cr,0, ion is: +2 92. Which of the following substances has the highest standard rodmcton poteatas? A. Li B. Cu B2 E. H2 93. Which one of the following is true? nY and negative Ai will be axothermic and ap nd rag Exothermic reactions are always fast

can someone please explain 91 and 92 in detail thank you

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Findin oxidat-ion Number (Cr) C+6) 92. Ir Electro chemi col Re, Flurine hZghedt 와andand reduction Pstertit SHandard reductn

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