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निम्नलिखित अभिक्रिया को आयन-इलेक्ट्रान विधि द्वारा संतुलित कीजिए-
`H^(+)+Cr_(2)O_(7)^(2-) +Fe^(2+) to 4ZnO_(2)^(2-)+NH_(3)+2H_(2)O`

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`6e^(-)+(Cr^(6+))_(2) to 2Cr^(3+)` (अपचयन अर्द्ध-अभिक्रिया)
`Fe^(2+) to Fe^(3+)+e^(-)` (ऑक्सीकरण अर्द्ध-अभिक्रिया)
(2) इलेक्ट्रान बराबर कर जोड़ने पर-
`(Cr^(6+))_(2)+6Fe^(2+) to 6Fe^(3)+2Cr^(3+)`
`(3) Cr_(2)O_(7)^(2-) +6Fe^(2+) to 6Fe^(3+)+2Cr^(3+)`
(4) O परमाणुओं को `H^(+)` तथा `H_(2)O` से संतुलित करने पर-
`14H^(+)+Cr_(2)O_(7)^(2-)+6Fe^(2+) to 6Fe^(3+)+2Cr^(3+)+7H_(2)O`

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