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Question
Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.
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Solution
In \[\ce{VO^{3-}_4}\] (Vanadate ion), Vanadium shows the +5 oxidation state, which is equal to its group number (5).
In \[\ce{Cr2O^{2-}_7}\] (Dichromate ion) and \[\ce{Cr^{2-}_4}\] (Chromate ion), chromium shows the +6 oxidation state, which is equal to its group number (6).
In \[\ce{MnO^-_4}\] (Permagnate ion), Manganese shows the +7 oxidation state, which is equal to its group number (7).
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Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
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