In the diagram above, the gas produced is
NO
NO2
N2O
N2O4
0
Correct answer: NO.
Explanation: Copper reacts with dilute nitric acid (here ~50%) to give nitrogen monoxide, NO, a colourless gas that can be collected over water:
3Cu + 8HNO3(dil) → 3Cu(NO3)2 + 2NO(g) + 4H2O
With concentrated nitric acid, brown NO2 would be produced instead (and it dissolves appreciably in water):
Cu + 4HNO3(conc) → Cu(NO3)2 + 2NO2(g) + 2H2O
Since the setup shows ~50% acid and gas collection over water, the gas is NO, not NO2, N2O, or N2O4.
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