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Cast iron is used for the manufacture of:

1. wrought iron and pig iron
2. wrought iron and steel
3. wrought iron, pig iron and steel
4. pig iron, scrap iron and steel

Correct answer: wrought iron and steel

Solution

Cast iron is remelted/refined to manufacture wrought iron (by removing carbon) and steel (by controlled decarburisation). Pig iron is the raw material made before cast iron, so it is not manufactured from cast iron. Correct: 'wrought iron and steel'.

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