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Quiz Chapter 4: Reactivity of Metals

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

10 questions · plays in fullscreen

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 minerals exists in an uncombined elemental state in the Earth's crust?

  1. Hematite
  2. Bauxite
  3. Gold
  4. Cassiterite
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Answer: C

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

2. 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
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Answer: B

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

3. Where is Carbon positioned in the Reactivity Series of Metals?

  1. Between Potassium and Sodium
  2. Between Aluminium and Zinc
  3. Between Zinc and Iron
  4. Between Copper and Gold
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Answer: B

Carbon can reduce zinc oxide but cannot reduce aluminium oxide, placing Carbon between Aluminium and Zinc.

4. 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
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Answer: A

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

5. 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
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Answer: A

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

6. Which set of metals is listed in ORDER OF INCREASING REACTIVITY towards oxygen?

  1. Potassium, Zinc, Iron, Copper
  2. Copper, Iron, Zinc, Magnesium
  3. Magnesium, Zinc, Iron, Sodium
  4. Gold, Aluminium, Calcium, Lead
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Answer: B

Increasing reactivity means least reactive first: Copper < Iron < Zinc < Magnesium.

7. Which metal burns with a brilliant bright white flame when reacting with oxygen?

  1. Copper
  2. Lead
  3. Magnesium
  4. Iron
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Answer: C

Magnesium reacts vigorously with oxygen when ignited, burning with an intensely bright white flame to form magnesium oxide.

8. 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
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Answer: B

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

9. What is the role of limestone ($CaCO_3$) in the blast furnace during iron extraction?

  1. To act as fuel to generate heat
  2. To reduce iron(III) oxide directly to iron
  3. To decompose and react with silica impurities to form slag
  4. To prevent the furnace from overheating
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Answer: C

Limestone thermally decomposes to quicklime ($CaO$), which reacts with sandy impurities ($SiO_2$) to form molten calcium silicate (slag, $CaSiO_3$).

10. What chemical formula represents the main component of bauxite ore?

  1. Fe_2O_3
  2. Al_2O_3
  3. PbS
  4. SnO_2
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Answer: B

Bauxite is the primary ore of aluminium and consists mainly of hydrated aluminium oxide ($Al_2O_3$).

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