Question

use oxidation states to identify the element that is being oxidized and the element that is being reduced in the redox reaction

Sn + 4HNO3 ---> SnO2 + 4NO2 + 2H2O
I see that SN is oxidized 0 --> 4+ and book says N is reduced +5 --> +4 I don't see that. Please help
HNO3.
H = +1.
O = 3*-2=-6
N must be +5 for HNO3 to be zero.

See the other post for NO2 of +4 for N.

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