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Electrochemistry

JEE Main 2024 (Online) 6th April Morning ShiftMCQMedium📈 Topic in 20% papers+4−1
Ques. 1JEE Main 2024, 6 April (Morning Shift)

A conductivity cell with two electrodes (dark side) are half filled with infinitely dilute aqueous solution of a weak electrolyte. If volume is doubled by adding more water at constant temperature, the molar conductivity of the cell will - [figure]

  1. depend upon type of electrolyte
  2. increase sharply
  3. decrease sharply
  4. remain same or can not be measured accurately

Answer

(4) remain same or can not be measured accurately

Solution

m = 1000M

∵ the solution is already infinitely dilute ⇒ m = m (limiting value, all molecules ionised)

Doubling the volume ⇒ κ and M both become half ⇒ m does not change

Also κ is now extremely small ⇒ it cannot be measured accurately

Answer: (4)

Keep practising — Electrochemistry

Ques. 2JEE Main 2024, 6 April (Evening Shift)

How can an electrochemical cell be converted into an electrolytic cell ?

  1. Applying an external opposite potential greater than E0cell
  2. Exchanging the electrodes at anode and cathode.
  3. Applying an external opposite potential lower than E0cell
  4. Reversing the flow of ions in salt bridge.
Ques. 3JEE Main 2024, 5 April (Morning Shift)

Molar ionic conductivities of divalent cation and anion are 57 S cm2 mol-1 and 73 S cm2 mol-1 respectively. The molar conductivity of solution of an electrolyte with the above cation and anion will be:

  1. 187 S cm2 mol-1
  2. 260 S cm2 mol-1
  3. 65 S cm2 mol-1
  4. 130 S cm2 mol-1
Ques. 4JEE Main 2024, 5 April (Morning Shift)

The reaction at cathode in the cells commonly used in clocks involves.

  1. oxidation of Mn from +2 to +7
  2. reduction of Mn from +4 to +3
  3. oxidation of Mn from +3 to +4
  4. reduction of Mn from +7 to +2
Ques. 5JEE Main 2024, 5 April (Evening Shift)

The quantity of silver deposited when one coulomb charge is passed through AgNO3 solution :

  1. 0.1 g atom of silver
  2. 1 chemical equivalent of silver
  3. 1 g of silver
  4. 1 electrochemical equivalent of silver
Ques. 6JEE Main 2024, 5 April (Evening Shift)

For the electrochemical cell M | M2+ || X | X2- If E0(M2+/M) = 0.46 V and E0(X/X2-) = 0.34 V. Which of the following is correct?

  1. Ecell = 0.80 V
  2. M + X M2+ + X2- is a spontaneous reaction
  3. Ecell = -0.80 V
  4. M2+ + X2- M + X is a spontaneous reaction
Ques. 7JEE Main 2024, 4 April (Morning Shift)

One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?

  1. Metal ion - Metal electrodes
  2. Oxidation - Reduction electrodes
  3. Metal - Insoluble Salt - Anion electrodes
  4. Gas - Ion electrodes
Ques. 8JEE Main 2024, 4 April (Morning Shift)

What pressure (bar) of H2 would be required to make emf of hydrogen electrode zero in pure water at 25 ?

  1. 0.5
  2. 10-14
  3. 1
  4. 10-7
Ques. 9JEE Main 2024, 4 April (Evening Shift)

Fuel cell, using hydrogen and oxygen as fuels, Choose the correct answer from the options given below:

  1. A, D, E only
  2. A, B, C only
  3. A, B, D only
  4. A, B, D, E only
Ques. 10JEE Main 2024, 4 April (Evening Shift)

For a strong electrolyte, a plot of molar conductivity against (concentration)1/2 is a straight line, with a negative slope, the correct unit for the slope is

  1. S cm2 mol-3/2 L
  2. S cm2 mol-3/2 L-1/2
  3. S cm2 mol-1 L1/2
  4. S cm2 mol-3/2 L1/2
Ques. 11JEE Main 2024, 1 February (Morning Shift)

The potential for the given half cell at 298 K is (-) 10-2 V 2H+(aq) + 2e- H2(g) [H+] = 1 M, PH2 = 2 atm (Given : 2.303 RT/F = 0.06 V, 2 = 0.3)

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