MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp -Block Elements (group 15-18)Previous Year Questions
Which of the following products will be obtained when copper metal is reacted with HNO3? (AIIMS 2018)
A.NO and N2O5
B.NO and NO2✓ Correct
C.NO2 and N2O5
D.HNO2 and N2
Explanation
The products of the reaction of copper with HNO3 depends upon the concentration of HNO3 used. Copper metal reacts with dilute HNO3 to form nitrogen (II) oxide (NO). 3 3 2 3Cu 8HNO (dil.) 3Cu(NO ) 2NO 4H O -> Copper metal reacts with conc. HNO3 to form nitrogen (IV) oxide or nitrogen dioxide (NO2). 3 3 2 2 2 Cu 4HNO (conc.) Cu(NO ) 2NO 2H O ->
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