In which of the following reactions can the oxidation number of the nitrogen be said to have increased?
A
2NO(g) + O2(g) → 2NO2(g)
B
2NO(g) + Cl2(g) → 2NOCl(l)
C
FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
D
NO(g) + Br2(l) → 2NOBr(l)
Verified Correct Answer: A.
Chemical Principles & Mechanism
In option A, the oxidation number of Nitrogen increased from +2 to +4.
In Option B, the oxidation number of Nitrogen decreased from +2 to +1 (Bearing in mind that the O.N of chlorine in hypochlorate, OCl\(^-\) is +1)
In Option C, the oxidation number of Nitrogen decreased from +2 to +1
In Option D, the oxidation number of Nitrogen decreased from +2 to +1 (Bearing in mind that the O.N of bromine in hypobromate OBr\(^-\) is +1)
Therefore, the answer is option A
Source: WAEC / JAMB / NECO Classroom Archive (Record #2957)