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Arrange the following compounds in decreasing order of the oxidation number of nitrogen.

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

Correct answer: HNO3, NO, N2, NH4Cl

Solution

The oxidation states are HNO3 (+5) > NO (+2) > N2 (0) > NH4Cl (-3), giving the decreasing order HNO3, NO, N2, NH4Cl.

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