Cast iron . . . . . . . . A. Is obtained by purifying pig iron B. Is manufactured in required shapes C. May contain 2 to 5 percent of carbon with other impurities D. All the above

The correct answer is D. All the above.

Cast iron is a type of iron alloy that is liquid at high temperatures and can be poured into molds to create objects of various shapes. It is made by melting pig iron and adding carbon and other impurities. The amount of carbon in cast iron can vary from 2 to 5 percent, and the other impurities can include silicon, manganese, sulfur, and phosphorus.

Cast iron is a strong and durable material that is resistant to wear and tear. It is often used in applications where strength and durability are important, such as in machinery, construction, and automotive parts.

Here is a brief explanation of each option:

• Option A: Cast iron is obtained by purifying pig iron. Pig iron is a type of iron that is produced in a blast furnace. It is a high-carbon iron that is not suitable for most applications. Cast iron is made by melting pig iron and adding carbon and other impurities to reduce the carbon content and make it more suitable for casting.
• Option B: Cast iron is manufactured in required shapes. Cast iron can be cast into a variety of shapes and sizes. This makes it a versatile material that can be used in a wide range of applications.
• Option C: Cast iron may contain 2 to 5 percent of carbon with other impurities. The amount of carbon in cast iron can vary from 2 to 5 percent. The other impurities can include silicon, manganese, sulfur, and phosphorus. The amount of these impurities can also vary depending on the type of cast iron being produced.

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