Explanation
Compound
HNO3
NO
NH4Cl
N2
Oxidation state of nitrogen
+5
+2
-3
0
Hence the order is HNO3 > NO > N2 > NH4Cl
Formula
Oxidation state of Fe
Hematite
Fe2O3
+3
Magnetite
Fe2O4(FeO+Fe2O3)
+2, +3
In all the given three equation , chlorine removes hydrogen from the other reactant to give products. Hence in I , II and III , chlorine acts as an oxidizing agent.
Oxidizing agent is a sub stance which oxidizes the other species but itself undergo reductiuon.
Hence,
2HI + H2SO4 → I2 + SO2 + 2H2O
In the above reaction, H2SO4 reduced to SO2 by oxidizing iodine (–1) to I2 (O).
O.N of C in C3O2 = 3x + 2 × (–2) = 0 or x = + 4/3.
In all these reactions the same substance is reduced as well as oxidised. Therefore, option (d) is correct.
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