Give two example to show that potassium dichromate is an oxidising agent.

Explanation

(i) Acidified potassium dichromate oxidises iodides to iodine.
`Cr_(2)O_(7)^(2-)+14H^(+)+6e^(-)rarr2Cr^(3+)+7H_(2)O`

(ii) Acidified potassium dichromate oxidises `Fe^(2+)` (ferrous) to `Fe^(3+)` [ferric[.
`Cr_(2)O_(7)^(2-)+14H^(+)+6e^(-)rarr2Cr^(3+)+7H_(2)O`