Chapter-12 Metals and Extraction — Online MCQ Test
CHEMISTRY · Grade 10 · IGCSE cambridge
Practice Chapter-12 Metals and Extraction with a free chapter-wise online MCQ test.
This chapter covers: The reactivity series extraction of metals from ores alloys and uses of common metals..
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-12 Metals and Extraction — Important Questions & Answers
Which of the following metals is the most reactive according to the reactivity series?
- A. Potassium
- B. Iron
- C. Copper
- D. Silver
Answer: A. Potassium
Potassium is at the top of the reactivity series, making it the most reactive metal. Metals become less reactive as you move down the series.
Potassium is at the top of the reactivity series, making it the most reactive metal. Metals become less reactive as you move down the series.
What is an ore?
- A. A pure metal found in nature
- B. A naturally occurring mineral from which a metal can be extracted profitably
- C. A synthetic compound used in metallurgy
- D. A metal that has been refined and purified
Answer: B. A naturally occurring mineral from which a metal can be extracted profitably
An ore is a naturally occurring mineral or rock that contains a metal in sufficient concentration to make extraction economically viable.
An ore is a naturally occurring mineral or rock that contains a metal in sufficient concentration to make extraction economically viable.
Why is copper extracted from its ore using carbon reduction rather than electrolysis?
- A. Because copper is too reactive
- B. Because copper is less reactive than carbon, so carbon can displace it
- C. Because electrolysis is too expensive
- D. Because copper doesn't form stable oxides
Answer: B. Because copper is less reactive than carbon, so carbon can displace it
Copper is below carbon in the reactivity series, so carbon can reduce copper oxide to copper. This is the displacement reaction: CuO + C → Cu + CO.
Copper is below carbon in the reactivity series, so carbon can reduce copper oxide to copper. This is the displacement reaction: CuO + C → Cu + CO.
A student observes that Metal X reacts vigorously with cold water, while Metal Y barely reacts with boiling water. Based on this observation, which statement is correct?
- A. Metal X is less reactive than Metal Y
- B. Metal X is more reactive than Metal Y and is positioned higher in the reactivity series
- C. Both metals are at the same position in the reactivity series
- D. Metal Y cannot be extracted from its oxide using any reduction method
Answer: B. Metal X is more reactive than Metal Y and is positioned higher in the reactivity series
A metal that reacts with cold water is more reactive than one requiring boiling water. This indicates Metal X ranks higher in the reactivity series than Metal Y.
A metal that reacts with cold water is more reactive than one requiring boiling water. This indicates Metal X ranks higher in the reactivity series than Metal Y.
A student claims that silver can be extracted from silver oxide (Ag₂O) using carbon reduction at high temperature. A second student disagrees, stating this will not work. Which student is correct and why?
- A. First student is correct; silver oxide can be reduced by carbon at any temperature
- B. Second student is correct; silver is below carbon in the reactivity series, but carbon monoxide produced will re-oxidise silver
- C. First student is correct; silver is above carbon in the reactivity series
- D. Second student is correct; silver is too reactive to be extracted by carbon reduction
Answer: B. Second student is correct; silver is below carbon in the reactivity series, but carbon monoxide produced will re-oxidise silver
Although silver is below carbon (allowing reduction), the CO produced can re-oxidise silver back to Ag₂O, making the process inefficient. Silver is typically extracted by other methods or from silver nitrate solution.
Although silver is below carbon (allowing reduction), the CO produced can re-oxidise silver back to Ag₂O, making the process inefficient. Silver is typically extracted by other methods or from silver nitrate solution.