NEET Chemistry Electrochemistry Class 12 Questions

For the cell reaction : 2Cu⁺(aq) → Cu(s) + Cu²⁺(aq), the standard cell potential is 0.36 V. The equilibrium constant for the reaction is

Given below are half-cell reactions: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O; E° = +1.510 V 1/2 Ω₂ + 2H⁺ + 2e⁻ → H₂O₂; E° = +1.223 V Will the permanganate ion, MnO₄⁻ liberate O₂ from water in the presence of an acid?

Using the data given below find out the strongest reducing agent. E° Cr₂O₇²⁻/Cr³⁺ = 1.33V E° Cl₂/Cl⁻ = 1.36V E° MnO₄⁻/Mn²⁺ = 1.51V E° Cr³⁺/Cr = -0.74V

The quantity of charge required to obtain one mole of aluminium from Al₂O₃ is ......

Reduction potentials of some ions are given below. Arrange them decreasing order of oxidising power.

The cell in which the following reaction occurs: 2Fe³⁺(aq) + 2I⁻(aq) → 2Fe²⁺(aq) + I₂(s) has E°cell = 0.236 V at 298 K. The equilibrium constant of the cell reaction is

E° cell = 1.1 V for Daniel cell. Which of the following expressions are correct description of state of equilibrium in this cell?

Given E°Ag⁺/Ag = +0.80 V ; E°Cu²⁺/Cu = +0.34 V ; E°Fe³⁺/Fe²⁺ = +0.76 V ; E°Ce⁴⁺/Ce³⁺ = +1.60 V Which of the following statements is not correct?

Λₘ⁰ for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm² mol⁻¹, respectively. If the conductivity of 0.001 M HA is 5 × 10⁻⁵ S cm⁻¹, degree of dissociation of HA is

If the conductance and specific conductance of a solution are same, then its cell constant is equal to:

E° value of Ni²⁺/Ni is^{-0}.25 V and Ag⁺/Ag is +0.80 V. If a cell is made by taking the two electrodes what is the feasibility of the reaction?

A weak monobasic acid is 5% dissociated in 0.01 mol dm⁻³ solution. Limiting molar conductivity of acid at infinite dilution is 4 × 10⁻² Ω⁻¹ m² mol⁻¹. What will be the conductivity of 0.05 mol dm⁻³ solution of the acid?

The specific conductivity of N/10 KCl solution at 20°C is 0.0212 Ω⁻¹ cm⁻¹ and the resistance of the cell containing this solution at 20°C is 55 Ω. The cell constant is

An electric charge of 5 Faradays is passed through three electrolytes AgNO₃, CuSO₄ and FeCl₃ solution. The grams of each metal liberated at cathode will be

The number of correct statements from the following is (A) Conductivity always decreases with decrease in concentration for both strong and weak electrolytes. (B) The number of ions per unit volume that carry current in a solution increase on dilution. (C) Molar conductivity increases with decrease in concentration. (D) The variation in molar conductivity is different for strong and weak electrolytes. (E) For weak electrolytes, the change in molar conductivity with dilution is due to decrease in degree of dissociation.

Mark the correct choice of electrolytes represented in the graph.

Given : Co³⁺ + e⁻ → Co²⁺ ; E° = +1.81 V Pb⁴⁺ + 2e⁻ → Pb²⁺ ; E° = +1.67 V Ce⁴⁺ + e⁻ → Ce³⁺ ; E° = +1.61 V Bi³⁺ + 3e⁻ → Bi ; E° = +0.20 V Oxidizing power of the species will increase in the order :

E° values for half cell reactions are given below : Cu²⁺ + e⁻ → Cu⁺ ; E° = 0.15 V Cu²⁺ + 2e⁻ → Cu ; E° = 0.34 V What will be the E° of the half-cell : Cu⁺ + e⁻ → Cu ?

The equation that is incorrect is

E° values of some redox couples are given below. On the basis of these values choose the correct option. E° values : Br₂/Br⁻ = + 1.90 ; Ag⁺/Ag(s) = + 0.80 ; Cu²⁺/Cu(s) = +0.34 ; I₂(s)/I⁻ = + 0.54 V

Which of the statements about solutions of electrolytes is not correct? (1) Conductivity of solution depends upon size of ions. (2) Conductivity depends upon viscosity of solution. (3) Conductivity does not depend upon solvation of ions present in solution. (4) Conductivity of solution increases with temperature.

For a cell involving one electron, E°cell = 0.59 V at 298 K, the equilibrium constant for the cell reaction is Given that F = 2.303RT at T = 298 K

Assertion: Zinc displaces copper from copper sulphate solution. Reason : The E° at 298 K of Zn is –0.76 V and that of Cu is +0.34 V.

Which of the following statements is correct? (1) Ecell and ΔG of cell reaction both are extensive properties. (2) Ecell and ΔG of cell reaction both are intensive properties. (3) Ecell is an intensive property while ΔG of cell reaction is an extensive property. (4) Ecell is an extensive property while ΔG of cell reaction is an intensive property.

The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm² mol⁻¹ respectively. The molar conductance of CH₃COOH at infinite dilution is. Choose the right option for your answer.

The molar conductivity is maximum for the solution of concentration

Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.

Which of the following is the cell reaction that occurs when the following half-cells are combined? I₂ + 2e⁻ → 2I⁻ (1 M) ; E° = +0.54 V Br₂ + 2e⁻ → 2Br⁻ (1 M) ; E° = +1.09 V

A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is: (Given: Molar mass of Cu = 63 g mol⁻¹; 1 F = 96487 C mol⁻¹)

Calculate emf of the half cell given below: Pt (s) | H₂(g, 2 atm) | HCl (aq, 0.02 M) E°H⁺/H₂ = 0 V (Given: 2.303 RT/F = 0.059, log 2 = 0.3010)

If the molar conductivity (Λₘ) of a 0.050 mol L⁻¹ solution of a monobasic weak acid is 90 S cm² mol⁻¹, its extent (degree) of dissociation will be [Assume Λₘ⁰ = 349.6 S cm² mol⁻¹ and Λ⁰ = 50.4 S cm² mol⁻¹.]

The E° value for the Mn³⁺/Mn²⁺ couple is more positive than that of Cr³⁺/Cr²⁺ or Fe³⁺/Fe²⁺ due to change of

Match List I with List II.

Mass in grams of copper deposited by passing 9.6487 Å current through a voltmeter containing copper sulphate solution for 100 seconds is: (Given : Molar mass of Cu : 63 g mol⁻¹, 1F = 96487 C)

The conductivity of centimolar solution of KCl at 25°C is 0.0210 ohm⁻¹ cm⁻¹ and the resistance of the cell containing the solution at 25°C is 60 ohm. The value of cell constant is -

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: In equation ΔrG = −nFEcell, value of ΔrG depends on n. Reasons R: Ecell is an intensive property and ΔrG is an extensive property. In the light of the above statements, choose the correct answer from the options given below:

Given below are half cell reactions: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O, E° = +1.51 V 1/2 Ω₂ + 2H⁺ + 2e⁻ → H₂O, E° = +1.23 V Will the permanganate ion, MnO₄⁻ liberate O₂ from water in the presence of an acid?

At 298 K, the standard electrode potentials of Cu²⁺/Cu, Zn²⁺/Zn, Fe²⁺/Fe and Ag⁺/Ag are 0.34 V, -0.76 V, -0.44 V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reaction CANNOT occur?

Find the emf of the cell in which the following reaction takes place at 298 K. Ni(s) + 2Ag⁺(0.001 M) → Ni²⁺(0.001 M) + 2Ag(s) (Given that E°cell = 1.05 V, 2.303RT/F = 0.059 at 298 K)

The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm² mol⁻¹ respectively. The molar conductance of CH₃COOH at infinite dilution is. Choose the right option for your answer.

The molar conductivity of 0.007 M acetic acid is 20 S cm² mol⁻¹. What is the dissociation constant of acetic acid? Choose the correct option. [Λ°_H⁺ = 350 S cm² mol⁻¹ Λ°_CH₃COO⁻ = 50 S cm² mol⁻¹]

On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be:

The number of Faradays(F) required to produce 20 g of calcium from molten CaCl₂ (Atomic mass of Ca = 40 g mol⁻¹) is:

For a cell involving one electron E°cell=0.59 V at 298 K, the equilibrium constant for the cell reaction is [Given that \( \frac{2.303RT}{F} = 0.059 \text{ V at } T = 298 \text{ K} \)]

For the cell reaction, 2Fe³⁺(aq) + 2I⁻(aq) → 2Fe²⁺(aq) + I₂(aq), E°cell = 0.24 V at 298 K. The standard Gibbs energy (ΔG°) of the cell reaction is [Given that Faraday constant F = 96500 C mol⁻¹]

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solutions of their salts are put under an electric field? (A) Na (B) K (C) Rb (D) Li

The pressure of H₂ required to make the potential of H₂ electrode zero in pure water at 298 K is ______.

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as

The weight of silver (atomic weight = 108) displaced by a quantity of electricity which displaces 5600 mL of O₂ at STP will be

When 0.1 mol MnO₄²⁻ is oxidised, the quantity of electricity required to completely oxidise MnO₄²⁻ to MnO₄⁻ is