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Complete and balance the following reactions 

(i) Zn + NO-3 = Zn2+ + NH+4

(ii) Cr2O2-7 + C2H4O = C2H4O2 + Cr3+

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(i) 4Zn + NO-3 + 10H+ = 4Zn2+ + NH+4 + 3H2O

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