MCQ practice · SSC Chemistry Board questions · Chapter 10: Mineral Resources: Metals and Non-metals
The ore of X in the stimulus is:
Think it through first, then pick an option.
- a Limonite
- b Galena
- c Cinnabar
- d Chalcocite
Answer and explanation
Correct answer: d Chalcocite
The element with 29 protons is copper; copper's ore is chalcocite (Cu₂S).
Why the other options are wrong
- a Limonite: Limonite is an iron ore (like Z, the rusting metal); X (proton number 29) is copper.
- b Galena: Galena is a lead ore; X is copper, whose ore is chalcocite.
- c Cinnabar: Cinnabar is a mercury ore; for X (29), copper, the ore is chalcocite.
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