Q1.General ScienceAsked in: RRB ALP · 02 May, 2025, Shift 2Medium
What is the main reason copper turns green over time?
- A.Hydrogen embrittlement
- B.Absorption of nitrogen from the air
- C.Reaction with UV light
- D.Formation of an oxide layer
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Correct answer: D. Formation of an oxide layer
Copper turns green because its surface slowly reacts with the air and gets covered by a layer of corrosion products, and that layer is green.
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