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Which of the following oxide can act as both reducing and oxidising agent?

(a) Dinitrogen oxide

(b) Nitric oxide

(c) Nitrogen dioxide

(d) Dinitrogen pentoxide

I have been asked this question during an internship interview.

I'd like to ask this question from P-Block Elements in portion P-Block Elements of Chemistry – Class 12

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The correct choice is (b) Nitric oxide

Explanation: Nitric oxide acts as both an oxidising agent and a reducing agent whereas all the other oxides of nitrogen act as oxidising agents only. The oxidising nature of nitric acid can be observed in its reaction with hydrogen sulphide while its reducing nature can be observed in its reaction with acidified potassium permanganate.

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