Question

Which from following properties is exhibited by cast iron ?

• A. It is very soft and contains \(4\%\) C.
• B. It is very soft and contains \(2\%\) C
• C. It is hard, brittle and contains \(4\%\) C.
• D. It is hard and contains less than \(0.2\%\) C.

Hint:

Cast iron has the highest carbon content among the forms of iron, which makes it hard and brittle.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
The properties of the forms of iron depend on their carbon content.

Step 2: Compare the forms
Wrought iron has the least carbon (about 0.2%) and is soft and malleable. Steel has 0.2 to 2% carbon. Cast iron has about 3 to 4% carbon.

Step 3: Cast iron
Because of the high carbon content, cast iron is hard and brittle, and it cannot be hammered or welded easily.

Final Answer:
Cast iron is hard, brittle and contains about 4% carbon. \[ \boxed{\text{(C) }\text{It is hard, brittle and contains }4\%\text{ C.}} \]