Presence of even 0.005% of _____________ in copper makes it highly brittle, rendering it useless for wire-drawing?
Correct answer: D. Bismuth
- A. Oxygen
- B. Arsenic
- C. Antimony
- D. Bismuth
Explanation
Even a very small amount of bismuth segregates at grain boundaries in copper and causes severe hot and cold brittleness, making wire-drawing impractical. Oxygen can also affect copper, but the classic trace impurity causing this extreme embrittlement is bismuth.
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