Redox & Electrochemistry

What happens to an atom when it is oxidized?

• It gains electrons

• It loses electrons

• It gains protons

• It loses neutrons

In a redox reaction, what is the role of the reducing agent?

• It gains electrons and gets oxidized

• It loses electrons and gets oxidized

• It gains electrons and gets reduced

• It loses electrons and gets reduced

• +1

• 0

• -2

• +2

Which of the following is a half-reaction?

What is the purpose of the salt bridge in an electrochemical cell?

• To increase the voltage

• To allow the flow of electrons

• To complete the circuit by allowing ion flow

• To separate the two half-cells physically

What is the standard electrode potential of hydrogen in electrochemistry?

• 0.00 V

• 1.23 V

• -0.76 V

• 2.07 V

Which of the following is a correct representation of a reduction half-reaction?

What is the main function of an electrolyte in an electrochemical cell?

• To prevent the flow of electrons

• To provide a medium for electron flow

• To provide a source of ions for the reaction

• To increase the cell voltage

Which of the following is an example of a spontaneous redox reaction?

• Charging a rechargeable battery

• Electrolysis of water

• The rusting of iron

• Splitting water into hydrogen and oxygen gas

What is the oxidation state of sulfur in sulfuric acid (H₂SO₄)?

• +4

• +6

• -2

• 0