The odd substance — Aptitude Question
The odd substance: Which one does not belong? Copper, Zinc, Brass, Iron Answer and worked solution on CodeKairo.
- Topic: Analogies & Classification
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 40 seconds
Question
Which one does not belong?
Copper, Zinc, Brass, Iron
Options
- Copper
- Zinc
- Brass
- Iron
Show the answer and the worked solution
Correct answer: C. Brass
Worked solution
- Copper, zinc and iron are elements.
- Brass is an alloy of copper and zinc, not an element.
Answer: Brass.
The idea
Element versus alloy is the intended split. Bronze and steel appear in the same family of questions.
Shortcut. Brass is made of two of the others (copper + zinc), so it cannot share their class — it is the one mixture among three elements.
Common trap. "Iron" — copper, zinc and brass look like one family (brass and its two ingredients), leaving iron as the outsider; but element versus alloy is the real split.
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