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Electrochemistry · Question 33

JEE Main 2025 (Online) 29th January Morning ShiftMCQEasy📈 Topic in 39% papers+4−1
1

For a Mg | Mg2+(aq) || Ag+(aq) | Ag the correct Nernst Equation is :

  1. Ecell = E cell - RT2F [Ag+]2[Mg2+]
  2. Ecell = E cell - RT2F [Mg2+][Ag+]
  3. Ecell = E cell - RT2F [Ag+][Mg2+]
  4. Ecell = E cell + RT2F [Ag+]2[Mg2+]

Answer

(4) Ecell = E cell + RT2F [Ag+]2[Mg2+]

Solution

Anode (oxidation): Mg Mg2+ + 2e-

Cathode (reduction): 2Ag+ + 2e- 2Ag

Cell reaction: Mg(s) + 2Ag+(aq) Mg2+(aq) + 2Ag(s), n = 2

Q = [Mg2+][Ag+]2 (pure solids are not written)

Ecell = E cell - RT2F [Mg2+][Ag+]2

Ecell = E cell + RT2F [Ag+]2[Mg2+]

Answer: (4)

JEE Main 2025 (Online) 29th January Morning Shift

Keep practising — Electrochemistry

2

The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed?

  1. Molar conductivity increases sharply with increase in concentration.
  2. Molar conductivity decreases sharply with increase in concentration.
  3. A small increase in molar conductivity is observed at infinite dilution.
  4. A small decrease in molar conductivity is observed at infinite dilution.
JEE Main 2025 (Online) 29th January Morning Shift
3

Given below is the plot of the molar conductivity vs concentration for KCl in aqueous solution. [figure] If, for the higher concentration of KCl solution, the resistance of the conductivity cell is 100 , then the resistance of the same cell with the dilute solution is 'x' . The value of x is (Nearest integer)

JEE Main 2025 (Online) 28th January Morning Shift
4

Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12. The current in Amperes used for the given electrolysis is . (Nearest integer).

JEE Main 2025 (Online) 28th January Evening Shift

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