Complete the following chemical equations :
(i) `Cr_2O_6^(2-)+6Fe^(2+)+14H^+to`
(ii) `2CrO_4^(2-)+2H^+to`
(iii) `2MnO_4^(-)+5C_2O_4^(2-)+16H^+to`

Explanation

Let's complete the given chemical equations step by step.

### (i) Completing the equation:
**Given:**
\[ \text{Cr}_2\text{O}_6^{2-} + 6 \text{Fe}^{2+} + 14 \text{H}^+ \]

**To find:**
The products of the reaction.
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