Which one of the following compounds does not exhibit a different oxidation number of the same element?

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Q: (NDA-II/2019)

Which one of the following compounds does not exhibit a different oxidation number of the same element?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,4,12,9,4,1,2

keywords: 

{'different oxidation number': [0, 0, 0, 1], 'fe3o4': [0, 0, 0, 1], 'fe2o3': [0, 0, 0, 1], 'compounds': [0, 0, 0, 3], 'mn3o4': [0, 0, 0, 1], 'pb2o4': [0, 0, 0, 1], 'same element': [0, 0, 0, 1]}

In this question, we are looking for a compound that does not exhibit a different oxidation number of the same element.

Option 1: Pb2O4

This compound contains lead (Pb) and oxygen (O). In Pb2O4, lead has an oxidation number of +4, which is different from other compounds where lead can have different oxidation numbers.

Option 2: Fe3O4

This compound contains iron (Fe) and oxygen (O). In Fe3O4, iron has two different oxidation numbers: +2 and +3. Therefore, this compound exhibits a different oxidation number of the same element.

Option 3: Fe2O3

This compound also contains iron (Fe) and oxygen (O). In Fe2O3, iron has an oxidation number of +3, which is consistent across all compounds containing iron and oxygen.

Option 4: Mn3O4

This compound contains manganese (Mn) and oxygen (O). In Mn3O4, manganese has two different oxidation numbers: +2 and +3. Therefore, this compound exhibits a different oxidation number of the same element.

Based on this analysis, option 2 is correct because Fe3O4 is the only compound that