arrow_backBack to Study Resources

Quiz Chapter 4: Reactivity of Metals

10 questions ยท Form 3 Science Bab 4: Reactivity of Metals

Question 1 of 10Score: 0

Which of the following metals can be extracted from its oxide ore by reduction using carbon powder?

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which of the following metals can be extracted from its oxide ore by reduction using carbon powder?

  1. Potassium
  2. Magnesium
  3. Tin
  4. Aluminium
Show answer

Answer: C

Tin ($Sn$) is situated below Carbon in the reactivity series, meaning Carbon can reduce tin oxide to tin metal.

2. Which environmental impact is directly associated with roasting sulfide ores during metal extraction?

  1. Acid rain caused by sulfur dioxide emission
  2. Eutrophication of rivers caused by nitrates
  3. Ozone layer depletion caused by CFCs
  4. Thermal pollution causing algae blooms
Show answer

Answer: A

Roasting sulfide metal ores releases sulfur dioxide gas ($SO_2$), which dissolves in rainwater to form acid rain.

3. Which reagent is used to confirm the presence of carbon dioxide gas emitted during a reaction?

  1. Acidified potassium manganate(VII)
  2. Limewater
  3. Litmus paper
  4. Anhydrous copper(II) sulfate
Show answer

Answer: B

Carbon dioxide gas reacts with clear limewater (calcium hydroxide) to produce insoluble calcium carbonate precipitate, making the limewater cloudy.

4. What term describes naturally occurring solid chemical elements or compounds found in Earth's crust?

  1. Plastics
  2. Minerals
  3. Polymers
  4. Synthetic compounds
Show answer

Answer: B

Minerals are inorganic elements or compounds found naturally with specific crystalline structures in the Earth's crust.

5. Where is Hydrogen positioned in the Reactivity Series of Metals?

  1. Between Aluminium and Carbon
  2. Between Zinc and Iron
  3. Between Iron and Lead
  4. Between Copper and Silver
Show answer

Answer: B

Dry hydrogen gas reduces iron oxide to iron when heated, but cannot reduce zinc oxide, placing Hydrogen between Zinc and Iron.

6. What are the chemical elements present in the mineral galena?

  1. Lead and Oxygen
  2. Lead and Sulfur
  3. Tin and Oxygen
  4. Copper and Carbon
Show answer

Answer: B

Galena is chemically known as lead(II) sulfide ($PbS$), which consists of lead and sulfur.

7. Which of the following minerals exists in an uncombined elemental state in the Earth's crust?

  1. Hematite
  2. Bauxite
  3. Gold
  4. Cassiterite
Show answer

Answer: C

Gold is a very unreactive metal, so it exists naturally as a free element rather than as a chemical compound.

8. What products are formed when calcium carbonate ($CaCO_3$) is heated strongly?

  1. Calcium metal and carbon dioxide
  2. Calcium oxide and carbon dioxide
  3. Calcium hydroxide and oxygen gas
  4. Calcium oxide and carbon monoxide
Show answer

Answer: B

Thermal decomposition of calcium carbonate yields solid calcium oxide (quicklime) and carbon dioxide gas: $CaCO_3 ightarrow CaO + CO_2$.

9. What is the chemical reaction when dilute hydrochloric acid is added to marble chips?

  1. Calcium chloride + Water + Carbon dioxide
  2. Calcium oxide + Hydrogen gas
  3. Calcium sulfate + Carbon monoxide + Water
  4. Calcium hydride + Chlorine gas
Show answer

Answer: A

Marble chips (calcium carbonate) react with dilute acid to produce a soluble salt, water, and carbon dioxide gas.

10. Predict what happens when dry hydrogen gas is passed over strongly heated aluminium oxide powder.

  1. Aluminium metal and water vapor are produced
  2. No reaction occurs because aluminium is more reactive than hydrogen
  3. Aluminium hydroxide powder forms immediately
  4. Explosive ignition creates carbon dioxide
Show answer

Answer: B

Aluminium lies higher than Hydrogen in the reactivity series, so Hydrogen is unable to reduce aluminium oxide.

Sponsored