Question

For the disproportionation of copper 2Cut → Cu2+ Cu, E° is (Given E° for Cu2+/Cu is 0.34 V and Eº for Cu2+/Cu+ is 0.15 V)
(1) 0.49 V
(2) -0.19 V
(3) 0.38 V
(4) -0.38 V ​

Answer 1

2Cu+ ..................... Cu2+ + Cu Eocell= ?

Cu2+ + 2e ..................... Cu ECu2+/Cu= 0.34V

Cu2+ + e ..................... Cu+ ECu2+/Cu+= 0.15V

Cu+ + e .................... Cu ECu+/Cu = 0.53V

So, EoCu+/Cu2+= 0.53-0.15 = 0.38V