Which one of the following oxides of nitrogen is known as anhydride of nitric acid ?

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Q: 30 (NDA-I/2016)

Which one of the following oxides of nitrogen is known as ‘anhydride’ of nitric acid ?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,6,28,6,16,6,6

keywords: 

{'nitric acid': [0, 0, 0, 2], 'nitrogen': [1, 1, 0, 2], 'n2o3': [0, 0, 0, 1], 'n2o5': [0, 0, 0, 1], 'n2o': [0, 0, 0, 2], 'no2': [0, 0, 1, 3], 'anhydride': [0, 0, 0, 1], 'oxides': [0, 0, 3, 11]}