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The correct order of N-compounds in its decreasing order of oxidation states is

1. HNO3, NO, N2, NH4Cl
2. HNO3, NO, NH4Cl, N2
3. NH4Cl, N2, NO, HNO3
4. HNO3, NH4Cl, NO, N2

Correct answer: HNO3, NO, N2, NH4Cl

Solution

The oxidation state of nitrogen in HNO3 is +5, in NO is +2, in N2 is 0, and in NH4Cl is -3. Arranging these in decreasing order gives HNO3 > NO > N2 > NH4Cl.

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