Electrochemistry Questions

A certain current liberates 0.504 g of H₂ in 2 hours. How many grams of copper can be liberated by the same current following for the same time in CuSO₄ solution-

The resistance of a solution ‘A’ is 40 ohm and that of solution ‘B’ is 70 ohm, both solutions being taken in the same conductivity cell. If equal volumes of solutions ‘A’ and ‘B’ are mixed, what will be the resistance of the mixture using the same ce

Two electrodes are fitted in conductance cell 1.5 cm apart while the area of cross section of each electrode is 0.75 cm². The cell constant is-

For an electrolytic solution of 0.05 mol L⁻¹, the conductivity has been found to be 0.0110 S cm⁻¹. The molar conductivity is-

The resistance of 0.01 N solution of an electrolyte AB at 328 K is 100 ohm. The specific conductance of solution is (cell constant = 1 cm⁻¹)-

Which of the following solutions has the highest equivalent conductance?

The variation of equivalent conductance vs decrease in concentration of a strong electrolyte is correctly given in the plot-

A conductance cell was filled with a 0.02 M KCl solution which has a specific conductance of 2.768 × 10⁻³ ohm⁻¹ cm⁻¹. If its resistance is 82.4 ohm at 25°C, the cell constant is-

The specific conductance of a solution is 0.3568 ohm⁻¹ cm⁻¹. When placed in a cell the conductance is 0.0268 ohm⁻¹. The cell constant is-

If mercury is used as cathode in the electrolysis of aqueous NaCl solution, the ions discharged at cathode are-

In the electrolysis of CuSO₄, the reaction: Cu²⁺ + 2e⁻ → Cu takes place at-

Which loses charge at cathode-

In electrolysis of a fused salt, the weight deposited on an electrode will not depend on-

A solution of Na₂SO₄ in water is electrolysed using Pt electrodes. The products at the cathode and anode are respectively-

1 mole of Al is deposited by X coulomb of electricity passing through aluminium nitrate solution. The number of moles of silver deposited by X coulomb of electricity from silver nitrate solution is-

When an aqueous solution of H₂SO₄ is electrolysed, the ion discharged at anode is-

Passage of 96500 coulomb of electricity liberates ........ litre of O₂ at NTP during electrolysis-

The passage of current through a solution of certain electrolyte results in the evolution of H₂ at cathode and Cl₂ at anode. The electrolytic solution is-

The standard EMF of the cell reactionis 1.02 V. The value of ∆0G° will be

Three faraday of electricity is passed through molten solutions of AgNO3, NiSO4 and CrCl3 kept in three vessels using inert electrodes. The ratio in mol in which the metals Ag, Ni and Cr will be deposited is-

The charge required to deposit 40.5 g of Al (atomic mass = 27.0 g) from the fused Al2(SO4)3 is

The equivalent conductivities at infinite dilution of the cation and the anion of a salt A2B are 140 and 80 ohm–1 cm2 eq-1 respectively. The equivalent conductivity (in ohm–1 cm2 eq–1) of the salt at infinite dilution is-

What is the % dissociation of CH3COOH, if equivalent conductivity at this dilution and at infinite dilution are 148 and 398 S cm²/mol respectively ?

Standard cell voltage for the cell Pb/Pb2+ ||Sn2+/Sn is −0.01V. If the cell is to exhibit Ecell = 0, the value of [Sn2+]/[Pb2+] should be antilogs of (approx)

4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be:

Which among the following transition elements has positive E°M²⁺/M value ?

The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.4, 425.90 and 91.0 S cm² mol⁻¹ respectively and at 25°C the molar conductance of 0.001 molar aqueous solution of CH₃COOH is 19 S cm² mol⁻¹. The percentage degree of ionizati

Match List-I with List-II The correct option is

At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm–1 cm2 mol–1 and at infinite dilution its molar conductance is 238 ohm–1 cm2 mol–1. The degree of ionization of ammonium hydroxide at the same concentration and

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is : [Charge on electron is = 1.6 × 10–19 C]

The molar conductances of NaCl, HCl and CH3COONa at infinite dilution are 126.45 , 426.16 and 91 ohm–1 cm2 mol–1 respectively. The molar conductance of CH3COOH at infinite dilution in ohm–1 cm2 mol–1 is

Limiting molar conductivity in water at 298 K is minimum for:

The correct cell representation for the given cell reaction is: 2Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s)

The expression connecting E°cell and Keq of the reaction occurring in a Galvanic cell is:

Which of the following statement is incorrect regarding H2–O2 fuel cells?

Given below are two statements: Statement I: In Daniell cell, Zn dissolves at anode and copper deposits at cathode when Eext. < 1.1V. Statement II: In Daniell cell, reduction half reaction occurs at zinc electrode while the oxidation half reaction oc

A factory produces 40 kg of calcium in two hours by electrolysis. How much aluminium can be produced by same current in 2 hours?

If the value of pH = 1 and pH2 = 1 atm, then the oxidation potential of hydrogen electrode is;

The correct relation between standard Gibbs energy and equilibrium constant is:

The standard Gibbs free energy change of the reaction is: Cu2+(aq) + Sn(s) → Cu(s) + Sn2+(aq)

If the molar conductivity of Mg2+ and Cl– at infinite dilution are respectively 106 S cm2 mol–1 and 76.3 S cm2 mol–1, then the limiting molar conductivity of MgCl2 is:

Number of Faraday required to reduce 2 moles of MnO4− to Mn2+ is;

Given below are two statements: Statement I: Primary batteries, after the use over a period of time cannot be reused again. Statement II: A secondary cell after use can be recharged.

3 Faradays of electricity are passed through molten Al2O3, aqueous solution of CuSO4 and molten NaCl taken in three different electrolytic cells. The amount of Al, Cu and Na deposited at the cathodes will be in the ratio:

If the E°cell for the given cell reaction is 1.10 V, then the value of log Kc (where, Kc = equilibrium constant) is; Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)

The overall reaction taking place in mercury cell is:

For given cell; Zn|Zn+2(C1) || Zn+2(C2)|Zn; ΔG is negative if

Which of the following cell is also known as Leclanché cell?

The product obtained at cathode during the electrolysis of dilute HCl is;

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A): Conductivity always decreases with decrease in concentration of both weak and strong electrolytes. Reason (R): The number of ions