The presence of impurities in iron_________________?
Correct answer: D. Decreases its melting point
- A. Increases its melting point
- B. Does not affect its melting point
- C. Makes it malleable
- D. Decreases its melting point
Explanation
Most impurities disrupt the regular iron lattice and lower the melting temperature, so impure iron melts over a lower or broader temperature range than pure iron. This is why cast iron and steel generally melt below pure iron.
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