`K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+4H_(2)O_(2)overset("ether")( rarr)K_(2)SO_(4)+X+H_(2)O`
The no. of oxygen atoms involved in peroxy bonds in `'X'` are

(i) K_(2)Cr_(2)O_(7)+KI+H_(2)SO_(4)to K_(2)SO_(4)+Cr_(2)(SO_4)_3+I_(2)+H_(2)O .

NaCl + K_(2)Cr_(2)O_(7)+H_(2)SO_(4) rarr NA_(2)SO_(4) + K_(2) SO_(4) +H_(2)O +X The oxidation state chromium in the product X

KMnO_(4) + H_(2)SO_(4) + H_(2)C_(2)O_(4) rarr K_(2)SO_(4)+MnSO_(4) + CO_(2) + H_(2)O . Balance this equation.

A mixture of K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) forms

Taking the example of the reaction K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+FeSO_(4)toK_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+Fe_(2)(SO_(4))_(3)+H_(2)O, explain how a redox reaction is balanced by oxidation number method.

C_(2)H_(5)OH overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to A overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to B A and B in the above reaction are