When `SO_(2)` is passed through acidic solution of potassium dichromate, then chromium sulphate is formed. Change in valency of chronium is

When SO_2 is passed through acidified solution of potassium dichromate, than chromium sulphate is formed . The change in oxidation number of chromium is :

When SO_(2) is passed through the solution of potassium iodate,the oxidation state of iodine changes from

When SO_2 is passed in a solution of potassium iodate, the oxidation state of iodine changes from :