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Q.

Correct order of purity in the following forms of iron is

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a

Pig > Cast > Wrought 

b

Cast > Pig > Wrought 

c

Pig > Wrought > Cast 

d

Wrought > Cast > Pig

answer is D.

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Detailed Solution

The carbon percentage in cast iron is 3-3.7%
The carbon percentage in pig iron is 3.8 -4.7%.
Wrought iron contains 0.12 to 0.25% carbon.
Purity : Wrought iron > cast iron > pig iron.

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