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Complete and balance the following react...

Complete and balance the following reactions:
(i). `Zn+NO_3^(ɵ)toZn^(2+)+NH_4^(o+)`
(ii). `Cr_2O_7^(2-)+C_2H_4OtoC_2H_4O_2+Cr^(3+)`

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(i). `4Zn+NO_3^(ɵ)+10H^(o+)to4Zn^(2+)+NH_4^(o+)+3H_2O`
(ii). `Cr_2O_7^(2-)+3C_2H_4O+8H^(o+)to3C_2H_4O_2+2Cr^(3+)+4H_2O`
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