In which of the following reactions has the oxidation number of nitrogen increased?

A. 2NO(g) + Br2(l) → 2NOBr(l)
B. 2NO(g) + O2(g) → 2NO2(g)
C. FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
D. 2NO(g) + Cl2(g) → 2NOCl(l)

Correct Answer:

Option B – FeSO4(aq) + NO(g) → Fe(NO)SO4(s)