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When copper reacts with hot concentrated nitric acid, copper(II) nitrate is formed along with a nitrogen oxide gas X: Cu + conc. HNO3 (hot) -> Cu(NO3)2 + X. What is X?

1. N2O
2. NO2
3. NO
4. N2O3

Correct answer: NO2

Solution

Concentrated nitric acid oxidizes copper and is itself reduced to brown NO2 gas, whereas dilute acid gives NO.

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