Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2022ChemistryElectrochemistryActual

Given below are half cell reactions : MnO 4 - + 8 H + + 5 e - → Mn 2 + + 4 H 2 O , E Mn 2 + / MnO 4 - o = - 1 . 510   V 1 2 O 2 + 2 H + + 2 e - → H 2 O E O 2 / H 2 O o = + 1 . 223   V Will the permanganate ion, MnO 4 - liberate O 2 from water in the presence of an acid?

Options

  1. ANo, because E cell o = - 0 . 287   V
  2. BYes, because E cell o = + 2 , 733   V
  3. CNo, because E cell o = - 2 . 733   V
  4. DYes, because E cell o = + 0 . 287   V

Correct answer

D. Yes, because E cell o = + 0 . 287   V

Step-by-step solution

The reaction between MnO 4 - and H 2 O is E o for the cell reaction:- E ° = E MnO 4 - / Mn + 2 o   +   E H 2 O / O 2 o = 1 . 510   V - 1 . 223   V E o = + 0 . 287   V As E ° of the cell reaction is positive, so this reaction is feasible. Therefore permanganate ion MnO 4 - liberate O 2 from water in presence of an acid. Hence, option D is correct.

Practice Electrochemistry on Quantrex Academy →

More from Electrochemistry

Calculate the conductivity of 0.025 M BaCl ₂ solution if the molar conductivity of salt at 25^ C is 325 ⁻¹ cm ^2 mol ⁻¹ . 2026Calculate the equilibrium constant at 25 ^ C for the cell reaction, Ni(s) + Cu ²⁺(1 M ) Ni ²⁺(1 M ) + Cu(s) if E^ _ cell is 0.592 V . 2026Calculate the time required in second to deposit 5.85 g Ni from NiCl ₂ solution by passing 10 A current (molar mass of Ni = 58.5 g mol ⁻¹ ) 2026Which of the following cell reactions is exhibited by fuel cell? 2026Which of the following types of cells is used for electroplating? 2026Which of the following acts as a cathode in a dry cell? 2026What is the Standard cell potential of a cell constituted by two electrodes, A (E^0_ A ^+/ A = 0.30 V ) and B (E^0_ B ^+/ B = +0.42 V ) ? 2026How long (in minutes) must a 2 A current be passed through AgNO ₃ solution to deposit 5.4 g Ag ? [Molar mass of Ag = 108 g mol ⁻¹ ] 2026 Full Electrochemistry list All NEET PYQs