Question 32
Metals and their CompoundsThe effect of the presence of impurities such as carbon and sulphur on iron is that they
- A.give it high tensile strength
- B.make it malleable and ductile
- C.increase its melting point
- D.lower its melting point
Show the answer and explanation
Answer: D (lower its melting point)
Explanation
Impurities lower the melting point of iron (cast iron melts lower than pure iron) and make it brittle.