JAMB - Chemistry (2005 - No. 5)
In which of the following reactions can the oxidation number of the nitrogen be said to have increased?
2NO(g) + O2(g) → 2NO2(g)
2NO(g) + Cl2(g) → 2NOCl(l)
FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
NO(g) + Br2(l) → 2NOBr(l)
Explanation
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
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