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Zn(0) ---> Zn(II) + 2e |*1
2e + 2 H(I) ---> H2(0) |*1
b) 3 K₂Cr₂O₇+ 42 HBr--> 6 CrBr₃+ 9 Br₂+ 21H₂O + 6 KBr
6e + 2 Cr(VI) ----> 2 Cr(III) |*3
2 Br(-I) ----> Br2(0) + 2e |*1
c) ...CH₃-CHO + ....Ag₂O---> ....CH₃-COOH+ 2Ag
C(I) ---> C(III) + 2 e |*1
2e + 2 Ag(I) ---> 2 Ag(0) |*1