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Which of the following reactions produce NO2 gas as the primary nitrogen oxide product?

1. Cu reacting with dilute HNO3
2. Zn reacting with dilute HNO3
3. Zn reacting with concentrated HNO3
4. Sn reacting with dilute HNO3

Correct answer: Zn reacting with concentrated HNO3

Solution

Concentrated HNO3 reacts with metals to give NO2. Zn with concentrated HNO3 gives NO2. Dilute HNO3 with most metals (Cu, Zn, Sn) gives NO, not NO2. Cu with dilute HNO3 produces NO (not NO2). So only Zn + conc. HNO3 produces NO2 among the given options.

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