Calculate the quantity of electricity needed to reduce one centimole of dichromate in acid medium, to chromic state.

Explanation

To solve the problem of calculating the quantity of electricity needed to reduce one centimole of dichromate in acidic medium to the chromic state, we can follow these steps:

### Step 1: Write the Reduction Reaction
The reduction of dichromate ion (\( \text{Cr}_2\text{O}_7^{2-} \)) in an acidic medium can be represented by the following half-reaction:

\[ \text{Cr}_2\text{O}_7^{2-} + 14 \text{H}^+ + 6 \text{e}^- \rightarrow 2 \text{Cr}^{3+} + 7 \text{H}_2\text{O} \]
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