15. It is known that the reaction of FeS2 with a certain concentration of HNO3 solution produces Fe(NO3)3, H2SO4 and a reduced N-containing byproduct. To consume 1 mole of FeS2, 8 moles of HNO3 are required. Which of the following is a byproduct of the reaction?
(A)NO
(B)N2O3
(C)N2O
(D)NH4NO3
(E)NO2
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