Copper reacts with conc. nitric acid to produce cupric nitrate and nitrogen dioxide as follows.
Cu + HNO3 → Cu(NO3)2 + NO2 + H2O
Which of the following balanced equations is correct?
1
Cu + 4 HNO3 → Cu(NO3)2 + 2 NO2 + 2H2O
2
2 Cu + 4 HNO3 → 2 Cu(NO3)2 + 2 NO2 + 2H2O
3
Cu + 2 HNO3 → Cu(NO3)2 + NO2 + 2 H2O
4
Cu + 4 HNO3 → Cu(NO3)2 + 2 NO2 + H2O