`K_(2)Cr_(2)O_(7)+FeSO_(4)+H_(2)SO_(4)rarr K_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+Fe_(2)(SO_(4))_(3)+H_(2)O`
a) How many electrons are transferred
b) What is the mole coefficient of H,30, in the above reaction? 

Explanation

Change in oxidation state of Cr of `K_(2)Cr_(2)O_(7)`
`= (2x+6)-(2x+3) = 6`
Change in oxidation state of Fe of `FeSO_(4) = +3-(+2) = 1`
Cris-crossing the changes `K_(2)Cr_(2)O_(7)=6FeSO_(4)`
a) Number of electrons transferred = 6
b) `K_(2)Cr_(2)O_(7)+6FeSO_(4)+7H_(2)SO_(4)rarr K_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+3Fe_(2)(SO_(4))_(3)+7H_(2)O`
Coefficient of `H_(2)SO_(4)=7`