Balance the following reaction by oxidation number method:
`CrO_(4)^(2-)+I^(ө)rarrCr^(3+)+IO_(3)^(ө)` ( in alkaline or basic medium)

Explanation

To balance the reaction `CrO4^(2-) + I^(-) → Cr^(3+) + IO3^(-)` in basic medium using the oxidation number method, follow these steps:

### Step 1: Determine Oxidation States
- For `CrO4^(2-)`, the oxidation state of Cr can be calculated as follows:
\[ X + 4(-2) = -2 \implies X - 8 = -2 \implies X = +6 \]
- For `I^(-)`, the oxidation state of I is -1.
...