Module 1 Electrochemistry

Galvanic cell/ Voltaic cell uses chemical energy to drive

• chemical reaction

• Electrical energy

• no reaction

• Biochemical reaction

What does the reducing agent do in an oxidation- reduction reaction?

• gains electrons from the oxidizing agent

• is always reduced

• loses electrons to the oxidizing agent

• is reduced by the oxidizing agent

In an electrolytic cell the electrode at which the electrons enter the solution is called the ____; the chemical change that occurs at this electrode is called as______

• Anode, oxidation

• Anode, reduction

• Cathode; reduction

• Cathode; oxidation

Calomel is a

• Mercury chloride mineral with formula Hg₂Cl₂ (mercury(I) chloride)

• Ferrous chloride

• Silver chloride mineral with formula AgCl (Silver (I) chloride)

• HgCl₂

If the electrode potentials of 2 electrodes at 298K are -0.44V and -0.24V, measure the standard emf.

• 0.4V

• 0.2V

• -0.2V

• -0.4V

_______ is a device that consists of two or more galvanic cells connected in series or parallel or both, which converts chemical energy into electrical energy through redox reactions.

• Battery

• Fuel cells

• Electrodes

Am electrode whose potential is measured with respect to SHE and then can be used as reference electrode for measuring potentials of other electrodes is referred to as

• Primary reference electrode

• Standard reference electrode

• Secondary reference electrode eg., Calomel electrode

Which of the following is formed at the cathode during discharging process of Ni-MH battery

• Nickel hydroxide

• Nickel hydroxide

• Lithium hydroxide

• Metal hydride

Electrolyte used in the Li-ion battery is

• Lithium Hexafluorophosphate

• KOH

• LiCoO2

• Ethylene carbonate

________can be defined as electrochemical cells that consist of two half-cells wherein the electrodes are the same but the concentration of electrolyte varies

• Electrolyte concentration cells

• Electrode concentration cells