Unit 5

An electrochemical cell can only convert electrical energy to chemical energy.

• True

• False

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

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

Which of the following is not a characteristic feature of a salt bridge?

• Salt bridge joins the two halves of an electrochemical cell

• It completes the inner circuit

• It is filled with a salt solution (or gel)

• It does not maintain electrical neutrality of the electrolytic solutions of the half-cells

Which of the following is not a type of electrochemical cell?

• Voltaic cell

• Photovoltaic cell

• Electrolytic cell

• Fuel Cell

What is the direction of flow of electrons in an electrolytic cell?

• Anode to cathode externally

• Anode to cathode internally

• Cathode to anode externally

• Cathode to anode in the solution

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

Which of the following is the example of the electrolytes?

• Acids

• Metals

• Alloys

• Oxides