Electrochemistry: The study of the production of electricity from the energy released during spontaneous chemical reactions.

This is an MCQ-based quiz on Electrochemistry.

This includes Electrolyte, Electrode, Electrolysis, Electrochemical cell, Voltaic cell, Photovoltaic cell, Electrolytic cell, and Fuel Cell.

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

1 0 10 1000

The units of conductivity are:

ohm^-1 ohm^-1 cm^-1 ohm^-2 cm² equiv^-1 ohm^-1 cm²

The specific conductance of 0.1 M NaCl solution is 1.06 × 10-2 ohm-1 cm-1. Its molar conductance in ohm-1 cm² mol-1 is

1.06 × 10² 1.06 × 10³ 1.06 × 104 53

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

3.324 cm-1 1.166 cm-1 2.372 cm-1 3.682 cm-1

The molar conductivity is maximum for the solution of concentration

0.004 M 0.002 M 0.005 M 0.001 M

Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on

The nature and structure of the metal

The number of valence electrons per atom

Change in temperature

All of these

Fused NaCl on electrolysis gives ………….. on cathode.

Chlroine Sodium Sodium amalgam Hydrogen

The standard electrode potentials for the half cell reactions are: Zn → Zn2-– 2e– E° = 0.76 V Fe → Fe2- + 2– E° = -0.41 V The emf of the cell reaction Fe2- + Zn → Zn2- + Fe is

-0.35 V +0.35 V -1.17 V +1.17 V

Which of the following is a secondary cell?

Leclanche cell Lead storage battery Concentration cell All of these

For a certain redox reaction, E° is positive. This means that

ΔG° is positive, K is greater than 1 ΔG° is positive, K is less than 1 ΔG° is negative, K is greater than 1 ΔG° is negative, K is less than 1

Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity of 0.0152 S cm-1 w ill be

124 Ω-1 cm² mol-1 204 Ω-1 cm² mol-1 101 Ω-1 cm² mol-1 300 Ω-1 cm² mol-1

An electrochemical cell generally consists of a cathode and an anode. Which of the following statements is correct with respect to the cathode?

Oxidation occurs at the cathode Electrons move into the cathode Usually denoted by a negative sign Is usually made up of insulating material

When equilibrium is reached inside the two half-cells of the electrochemical cells, what is the net voltage across the electrodes?

> 1 < 1 = 0 Not defined

Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell?

NaCl KNO3 KCl ZnSO4

Which of the following statements is correct regarding Electrochemical cells?

Cell potential is an extensive property Cell potential is an intensive property The Gibbs free energy of an electrochemical cell is an intensive property Gibbs free energy is undefined for an electrochemical cell

Which of the following factors does not affect the electrode potential of an electrode?

Nature of the electrode (metal) Temperature of the solution Molarity of the solution Size of the electrode

Faraday’s law of electrolysis is related to

Atomic number of cation

Speed of cation

Speed of anion

Equivalent weight of electrolyte

Units of the properties measured are given below. Which of the properties has been not matched correctly?

Molar conductance = Sm2 mol-1

Cell constant = m-1

Specific conductance of = S m²

Equivalence conductance = S m² (g eq)-1