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प्रश्न
Write the name of gas released when Cu is added to the conc. HNO3
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उत्तर
With Conc.HNO3 → Nitrogen dioxide (NO2)
\[\ce{Cu +\underset{\text{(conc.)}}{4HNO3}->Cu(NO3)2 +2NO2 +2H2O }\]
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