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0 0 P= +5x2 O= -2x5
P₄ oksidasi
Zn + HNO₃ --> Zn(NO₃) + NO₂ + H₂O
0 +1 +5 -6 Zn=+2 N=+2 O=-2x3 N=+4 O=-2x2 H=+2 O=-2
Zn oksidasi
0 0 = +5 -2
Jadi P4 oksidasi karena biloksnya naik
Zn + HNO3 = Zn(NO3) + NO2 + H20
0 +1+4-2 = +2+4-2 +4-2 +1-2
Jadi Zn oksidasi karena biloknya naik