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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
Question
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
iron(II) solution
✓

Answer

Iron (II) solution: Ferrous salts (Fe2+) are oxidised ferric (Fe3+) salts when they are treated with acidified K2Cr2O7.
Reaction:
$\text{Cr}_2\text{O}_7^{2-}+14\text{H}^{+}+6\text{e}^-\rightarrow2\text{Cr}^{3+}+7\text{H}_2\text{O}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 6\text{Fe}^{2+}\rightarrow6\text{Fe}^{3+}+6\text{e}^-\\\overline{\text{Cr}_2\text{O}^{2-}_7+6\text{Fe}^2+14\text{H}^+\rightarrow2\text{Cr}^{3+}+6\text{Fe}^{3+}+7\text{H}_2\text{O}}$

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