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Question:

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:

NOandN2O

NO2andN2O

NO2andNO

N2OandNO2

Solution:

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces N2O and NO2.
a. 4Zn+10HNO3(dil)→4Zn(NO3)2+NH4NO3+3H2O
NH4NO3→N2O+2H2O
b. Zn+4HNO3(conc)→Zn(NO3)2+2NO2+2H2O