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Is it okay to reverse reduction half equations when quoting them? watch

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    In edexcel alevel chemistry data booklet only reduction potential equations are given. For an e theta cell value one of the equations is to be reversed to make an oxidation potential equation. Instead of quoting two reduction equations it is easier to write one as oxidation equation and then adding the two to make the redox equation for e theta cell value. However in markscheme i have always seen only reduction equation quoted.
 
 
 
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