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Q.

Is it true that iron is mixed with about 0.05% carbon to make it hard and strong?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
Pure iron is very soft and cannot be used. Carbon is added to the iron in order to make it hard and strong because it prevents the dislocation of the iron atoms in the crystal lattice from sliding past each other. Steel is an iron alloy with a few tenths of a percent carbon added to improve its strength and fracture resistance when compared to other forms of iron.
  
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Is it true that iron is mixed with about 0.05% carbon to make it hard and strong?