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Na + N + 3O = 0
1 + N + 3(-2) = 0
N = +5
K2Cr2O7
2K + 2Cr + 7O = 0
2.1 + 2Cr + 7.(-2) = 0
Cr = +6
HNO2
H + N + 2O = 0
1 + N + 2(-2) = 0
N = +3