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The reaction between chromium(VI) and formaldehyde in aqueous perchloric acid is inhibited by manganese(II) ion, according to the relation k1=a/(1 +b[Mn2+])+c; manganese(II) ion and formaldehyde compete to reduce the intermediate CrIV, and CrII is an intermediate.
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Perez‐Benito et al. (1992) studied this question.
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