Question

Acidified potassium dichromate reacts with potassium iodide and oxidises it to `I_(2)`. The oxidation state of chromium in the products of reaction is + x. The value of x is :

Answer 1

Correct Answer - 3
During the reaction `K_(2)Cr_(2)O_(7)` is oxidised to `Cr_(2)(SO_(4))_(3)`
`overset(+6)K_(2)Cr_(2)O_(7)+7H_(2)SO_(4)+6KI`
`overset(+3)(K_(2)SO_(4)+Cr_(2)(SO_(4))_(3))+7H_(2)O+I_(2)`
X is +3 in `Cr_(2)(SO_(4))_(3)`