MCQ practice · SSC Chemistry Board questions · Chapter 10: Mineral Resources: Metals and Non-metals
Which element can be extracted by auto-reduction?
Think it through first, then pick an option.
- a Aluminium
- b Lead
- c Zinc
- d Copper
Answer and explanation
Correct answer: d Copper
Sulfides of less reactive metals such as Cu, Hg and Ag are reduced by heating alone.
Why the other options are wrong
- a Aluminium: Al is highly reactive and needs electrolysis; copper is auto-reduced.
- b Lead: Lead is medium reactive and carbon-reduced; the answer is copper.
- c Zinc: Zinc is carbon-reduced; copper is auto-reduced.
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