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When copper is heated with conc. HNO3 it produces:

1. Cu(NO3)2 and NO2
2. Cu(NO3)2 and NO
3. Cu(NO3)2, NO and NO2
4. Cu(NO3)2 and N2O

Correct answer: Cu(NO3)2 and NO2

Solution

When copper reacts with concentrated HNO3, it forms copper nitrate (Cu(NO3)2) and nitrogen dioxide (NO2) gas due to the oxidizing nature of HNO3.

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