NDA 2018 Chemistry question

Which one of the following reactions will give NO (nitric oxide) gas as one of the products?

Answer: (A)

Solution

Copper reduces dilute nitric acid to nitric oxide: 3Cu + 8HNO_3 \rightarrow 3Cu(NO_3)_2 + 2NO + 4H_2O. With concentrated acid

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Question ID VK-031170