Mastering Redox: Metals and Their Extraction

Which of the following metals is the most reactive according to the metal reactivity series?

• Gold

• Sodium

• Iron

• Copper

What is the main role of carbon in the extraction of metals from their oxides?

• To act as a catalyst

• To provide energy for the reaction

• To reduce the metal oxide to the metal

• To oxidize the metal further

Which of the following is a general equation for the reduction of a metal oxide?

• Metal + Oxygen → Metal Oxide

• Metal Oxide + Carbon → Metal + Carbon Dioxide

• Metal Oxide + Water → Metal Hydroxide

• Metal Oxide + Carbon Dioxide → Metal + Oxygen

In a displacement reaction, which of the following statements is true?

• A more reactive metal will displace a less reactive metal from its compound.

• A less reactive metal will displace a more reactive metal from its compound.

• All metals can displace hydrogen from water.

• Displacement reactions do not involve a change in oxidation states.

Which metal listed below would not be extracted from its ore using carbon?

• Iron

• Zinc

• Aluminum

• Lead

What is the correct order of metals based on their reactivity from highest to lowest?

• Aluminum, Zinc, Iron, Copper

• Copper, Iron, Zinc, Aluminum

• Zinc, Copper, Iron, Aluminum

• Aluminum, Iron, Zinc, Copper

Which of the following reactions is an example of a reduction reaction?

• 2Al + 3CuO → Al2O3 + 3Cu

• 2Fe + 3Cl2 → 2FeCl3

• C + O2 → CO2

• CaCO3 → CaO + CO2

Which of the following is a correct statement about the reactivity series of metals?

• Potassium is less reactive than lithium.

• Silver is more reactive than magnesium.

• Calcium is more reactive than sodium.

• Gold is less reactive than platinum.