Chemistry

Chemistry

Problem

In group separation, before precipitating out group III metal ions as hydroxides, it is necessary to boil then solution of the salt mixture with a few drops of concentrated HNO3\text{HNO}_3 is treated. This is done to convert: a. Co2+\text{Co}^{2+} to Co3+\text{Co}^{3+} b. Fe2+\text{Fe}^{2+} to Fe3+\text{Fe}^{3+} c. Mn2+\text{Mn}^{2+} to MnO4−\text{MnO}_4^- d. Cr3+\text{Cr}^{3+} to CrO42−\text{CrO}_4^{2-}

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