Verified Solution • 2025–26 Session moderate

QAIPM-2000-Ch-2963: NEET 2000 Chemistry - Class 12 AIPM-2000-Ch-2963 Solution: For the disproportionation of copper \(2Cu^+ Cu^{2+}+Cu\), \(E^ …

For the disproportionation of copper 2Cu+→Cu2++Cu2Cu^+\rightarrow Cu^{2+}+Cu, E∘E^\circ is (Given E∘E^\circ for Cu2+/CuCu^{2+}/Cu is 0.34 V and E∘E^\circ for Cu2+/Cu+Cu^{2+}/Cu^+ is 0.15 V.)

Multiple Choice Options

  • A 0.49 V
  • B −0.19-0.19 V
  • C 0.38 V
  • D −0.38-0.38 V

Step-by-Step Verified Solution

Cu 2+ + 2e � _ Cu; E� 1 = 0.34 V .....(1) Cu 2+ + e � _ Cu + ; E� 2 = 0.15 V.....(2) Cu + + e � _ Cu; E� 3 = ? .....(3) _ _ G o 1 = -2 _ 0.34 _ F and _ G o 2 = -1 _ 0.15 _ F and _ G o 3 = -1 _ E� 3 _ F Also, _ G o 1 = _ G o 2 + _ G o 3 _ -0.68F = -0.15F - E� 3 _ F _ E� 3 = 0 68 - 0 15 = 0 53 V _ E� cell = 0.53 - 0.15 = 0.38 V

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