Describe the oxidizing action of with the following. `K_(2) Cr_(2) O_(7)`Write ionic equations for its reaction (acidic medium) with :
`I^(-)`

Explanation

To describe the oxidizing action of \( K_2Cr_2O_7 \) (potassium dichromate) in acidic medium and to write the ionic equations for its reaction with \( I^- \) (iodide ion), we can follow these steps:

### Step 1: Determine the oxidation states
In \( K_2Cr_2O_7 \), the oxidation state of chromium (Cr) can be calculated as follows:
- Let the oxidation state of Cr be \( x \).
- The overall charge of the dichromate ion \( Cr_2O_7^{2-} \) is \( -2 \).
- The contribution of oxygen (O) is \( 7 \times (-2) = -14 \).
- Therefore, the equation becomes:
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