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
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To determine which reaction resulted in the greatest increase in the oxidation number of nitrogen, let's look at the changes in oxidation states more closely:
A: 2NO(g) + O2(g) → 2NO2(g)
Nitrogen goes from +2 in NO to +4 in NO2.
The change is +2.
B: NO(g) + Cl2(g) → NOCl2(l)
Nitrogen goes from +2 in NO to +3 in NOCl2.
The change is +1.
C: FeSO4 + NO(g) → Fe(NO)SO4(s)
Nitrogen stays at +2 in both reactants (NO) and products (Fe(NO)SO4).
The change is 0.
D: NO(g) + Br2(l) → NOBr2(l)
Nitrogen goes from +2 in NO to +3 in NOBr2.
The change is +1.
Conclusion:
The oxidation number of nitrogen increased the most in reaction A, where it increased by +2 (from +2 to +4).

The one that increased more than the others is considered to b the answer...u get😘

Thank you all for your contributions. Kindly look through the explanation provided above. The question was actually repeated from Year 2001, Question 28.
If you need further clarification, refer to video explanation below:
https://www.youtube.com/watch?v=L3LMarDpyDw







