Electrochemistry Quiz

When an experiment was set-up s shown in the Figure, the voltmeter showed a reading although there were no reactions occurring at the electrodes.

What is liquid X?

• A.

  Dilute aqueous sodium bromide

• B.

  Mercury

• C.

  Molten sodium bromide

• D.

  Oil

Aqueous copper(II) sulfate is electrolysed using carbon electrodes.

What would you expect to see during electrolysis?

• A. ANODE: colourless gas forms

  CATHODE:

  reddish brown/pink solid forms

• B. ANODE: colourless gas forms

  CATHODE: cathode dissolves

• C. ANODE:

  reddish brown/pink solid forms

  CATHODE:

  colourless gas forms

• D. ANODE:

  reddish brown/pink solid forms

  CATHODE:

  cathode dissolves

In the electrolysis of dilute sulfuric acid, what would you expect to see at each electrode?

• A

  ANODE:

  Hydrogen gas

  CATHODE:

  Oxygen gas

• B

  ANODE:

  Oxygen gas

  CATHODE:

  Hydrogen gas

• C

  ANODE:

  Oxygen gas

  CATHODE:

  Sulfur dioxide gas

• D

  ANODE:

  Sulfur dioxide gas

  CATHODE:

  Hydrogen gas

The heat reflecting shield of space rockets are electroplated with gold. Which of the following are the most likely electrodes and electrolyte used to gold-plate the heat shield?

 

• A

• B

• C

• D

In a hydrogen-oxygen fuel cell, ____________

• A.

  Electricity is generated by the reaction between hydrogen and oxygen

• B.

  Electricity is used to produce heat energy

• C.

  Electricity is used to produce hydrogen and oxygen

• D.

  hydrogen is burnt to form steam

The following reactions occur during the manufacture of iron.

Which is NOT a redox reaction?

What is the formula of iron(III) oxide?

• FeO

• FeO₃

• Fe₂O₃

• Fe₃O

The oxidation number of a metal ion is the same as the oxidation number of ___________________

• A.

  charges on its ion

• B.

  neutrons in its nucleus

• C.

  protons in its nucleus

• D.

  shells in its atom

Which change is NOT an example of reduction?

• A.

  Chlorine (Cl₂) to hydrogen chloride (HCl)

• Iron to Iron(II) ions

• Iron(III) oxide to iron

• Nitrogen (N₂) to ammonia (NH₃)