Which one of the following nitrogen oxides has the highest oxidation state of nitrogen?

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Q: 25 (CDS-II/2018)

Which one of the following nitrogen oxides has the highest oxidation state of nitrogen?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,10,18,5,8,5,10

keywords: 

{'nitrogen oxides': [0, 0, 0, 1], 'highest oxidation state': [0, 0, 0, 1], 'no2': [0, 0, 1, 3], 'nitrogen': [1, 1, 0, 2], 'n2os': [0, 0, 0, 1], 'n20': [0, 0, 0, 1]}