JEE Main Chemistry Electrochemistry Online Test – JEE Main Mock Test

The cell constant of a conductivity cell ………… .

Electrolysis, involves oxidation and reduction respectively at

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

The standard oxidation potentials for Mn³⁺ ion acid solution are   MnO₂. Is the reaction 2MN³⁺ + 2H₂O → Mn²⁺ + MnO₂ + 4H⁺ spontaneous under conditions of unit activity? What is the change in free energy?

The platinum electrodes were immersed in a solution of cupric sulphate and electric current was passed through the solution. After sometimes, it was found that color of copper sulphate disappeared with evolution of gas at the electrode. The colorless solution contains

In the galvanic cell,

Fe(s) + 2Fe³⁺(aq) → 3Fe²⁺ (aq)

If a salt bridge is removed from the two half cells, the voltage

In anodizing

When a lead storage battery is charged, it acts as

Al³⁺ (aq) + 3e^– → Al(s);                      E° = – 1.66 V

Cu²⁺ (aq) + 2e^– → Cu(s);                    E° = + 0.34 V

What voltage is produced under standard conditions to give a spontaneous reactions by combination of these two half-cells?

A solution of sodium sulphate in water is electrolyzed using inert electrodes. The products at the cathode and anode are respectively

Consider the following sets

Blue color solution changes to colorless (or fades) in

If the DG of a cell reaction AgCl + e^– → Ag + Cl^– is – 21.20 kJ, the standard emf of cell is

Consider the half-cell reactions,

H₂O₂ → O₂ + 2H⁺ + 2e^–                 E° = – 0.69 V

H₂O₂ + 2H⁺  + 2e^– → 2H₂O                          E° = 1.77 V

Fe²⁺ → Fe³⁺ + e^–                  E° = 0.771 V

Fe → Fe²⁺ + 2e^–                   E° = 0.44 V

If H₂O₂ is mixed with Fe²⁺, which reaction is more likely?

Aqueous solution of NaCl containing a small amount of MeOH (methyl orange) is electrolyzed using Pt-electrodes. The color of the solution after some time will:

In a galvanic cell, the electrons flow from

For the electrochemical cell,

H₂(g) 1 atm | H⁺ (1 M) || Cu²⁺ (1 M) | Cu(s)

Which one of the following statements is true?

When a dilute aqueous Li₂SO₄ solution is electrolyzed, the products formed at the anode and cathode, respectively, are

Using the standard electrode potential values given below, decide which of the statements, I, II, III and IV are correct. Choose the right answer from (A) (B) (C) and (D)

Fe²⁺ + 2e^– ⇌ Fe           ;           E⁰ = – 0.44 V

Cu²⁺ + 2e^– ⇌ Cu          ;           E⁰ = + 0.34 V

Ag⁺ + e^– ⇌ Fe              ;           E⁰ = + 0.80 V

I. Copper can displace iron from FeSO₄ solution.

II. Iron can displace copper from CuSO₄ solution

III. Silver can displace copper from CuSO₄ solution

IV. Iron can displace silver from AgNO₃ solution

The standard electrode potential for the following reaction is + 1.33 V. What is the potential at pH = 2.0?

Cr₂O₇^2– (aq, 1M) + 14 H⁺ (aq) + 6e^– → 2Cr³⁺ (aq. 1 M) + 7H₂O (l)

A gas X at 1 atm is bubbled through a solution containing a mixture of 1 M y^– and 1 M z^– at 25⁰C. If the order of reduction potential is z > y > x then

1 Faraday of electricity is passed through the solutions containing 1mole each of CuSO₄, AlCl₃ and SiCl₄. Number of moles of Cu, Al and Si formed will be in the ratio

1 mole of electrons passes through each of the solution of AgNO₃, CuSO4 and AlCl₃ when Ag, Cu and Al are deposited. Their molar ratio will be

The limiting equivalent conductivity of NaCl, KCl and KBr are 126.5, 150.0 and 151.5 S cm² eq^–1, respectively the limiting equivalent ionic conductance for Br^– is 78 S cm² eq^–1. The limiting equivalent ionic conductance for Na⁺ ions would be:

On passing 1 F of electricity through the electrolytic cells containing Ag⁺, Ni²⁺ and Cr³⁺ ions solution, the deposited Ag(at. Wt. = 108), Ni (at. Wt. = 59) and Cr (at. wt. = 52) is

Which of the following statements is true for fuel cells?

Debye Huckel theory predicts

The equivalent conductance of Ba²⁺ and Cl^– are respectively 127 and 76Ω^–1 cm² equiv^–1 at infinite dilution. The equivalent conductance (in Ω^–1 cm² equiv^–1) of BaCl₂ at infinite dilution will be

The standard potential at 25°C for the following half–reactions are given against them

Zn²⁺ + 2e^– → Zn; E° = – 0.762 V

Mg²⁺ + 2e^– → Mg; E° = – 2.37 V

When zinc dust is added to the solution of MgCl₂,

In Hall process, in the production of Al, carbon is used as the anode material. The reaction are