Q31 / 116 · NTA Abhyas (NEET) 2020 · Chemistry · General Principles and Processes of Isolation of Metals

The heating rods of iron embedded in charcoal powder are used to make railway wagon axles. The process is known as

  • Correct answer
    A
    Case hardening
  • B
    Sheradizing
  • C
    Annealing
  • D
    Tempering

Solution

Case hardening : The process of hardening the surface of wrought iron by depositing a surface layer of steel on it is called case-hardening it is done by heating wrought iron in contact with potassium ferrocyanide.
Alternatively, case hardening can also be done by heating wrought iron with charcoal and then plunging it a suitable oil.

Hence, the correct answer is option: 'A'.

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