JEE Advanced Model Paper 16 with solutions for online practice

Copper reduces NO3− into NO and NO2 depending upon concentration of HN3 in solution. Assuming [Cu2+] = 0.1 M and PNO = PNO2 = 10−3 bar. At which concentration of HNO3 , thermodynamic tendency for reduction of NO3− into NO and NO2 by copper issame ? [Given : E°Cu2+∕Cu = + 0.34 V , E°NO3−∕NO = + 0.96 V , E°NO3−∕NO2 = + 0.79 V]