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Standard XII
Chemistry
Allotropes of Carbon
Question

What is the percentage of carbon in hard steel?
  1. 0.1 to 0.4
  2. 1.5 to 2.5
  3. 2.5 to 3.5
  4. 0.5 to 1.5

A
1.5 to 2.5
B
2.5 to 3.5
C
0.1 to 0.4
D
0.5 to 1.5
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Solution
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Hard steel usually refers to quenched or quenched and tempered steel.

The percentage of carbon in hard steel is 0.5 to 1.5.

Hence, option D is correct.

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