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Consider the following reaction: 6FeS...

Consider the following reaction:
`6FeSO_(4)+K_(2)Cr_(2)O_(7)+7H_(2)SO_(4)to 3Fe_(2)(SO_(4))_(2)+Cr_(2)(SO_(4))_(3)+K_(2)SO_(4)+7H_(2)O`
How many electrons are involved in the aboYc redox reaction?

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(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 .

Na_(2)CO_(3), " " Fe_(2)(SO_(4))_(3), " " FeSO_(4).7H_(2)O

Balance the following equation by ion-electron method : K_(2)Cr_(2)O_(7)+FeSO_(4)+H_(2)SO_(4)toK_(2)SO_(4)+Cr_(3)(SO_(4))_(3)+Fe_(2)(SO_(4))_(3)+H_(2)O

Balance the following equation by oxidation number method: K_(2)Cr_(2)O_(7)+FeSO_(4)+H_(2)SO_(4)=Cr_(2)(SO_(4))_(3)+Fe_(2)(SO_(4))+K_(2)SO_(4)+H_(2)O