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Indicate the steps in the preparation of: (i) K_(2)Cr_(2)O_(7) from chromite ore. (ii) KMnO_(4) from pyrolusite ore. |
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Answer» Solution :(i) `4FeCr_(2)O_(4) + 8Na_(2)CO_(3) + 7O_(2) RARR 8Na_(2) CrO_(4) + 2Fe_(2)O_(3) + 8CO_(2)` `2Na_(2)CrO_(4) + 2H^(+) rarr Na_(2)Cr_(2)O_(7) + 2Na^(+) + 2H_(2)O` `Na_(2)Cr_(2)O_(7) + 2KCl rarr K_(2)Cr_(2)O_(7) + 2NaCl` (ii) `2MnO_(2) + 4KOH + O_(2) overset(Delta)rarr 2K_(2)MnO_(4) + 2H_(2)O` `3MnO_(4)^(2-) + 4H^(+) rarr 2MnO_(4)^(-) + MnO_(2) + 2H_(2)O` |
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