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General Principles and Processes of Isolation of Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryGeneral Principles and Processes of Isolation of Elements1 Mark
MCQ
Aluminium is used in thermite welding because it:
  • A
    Is a light metal.
  • ✓
    Has more affinity for oxygen.
  • C
    Is a strong oxidising agent.
  • D
    Is a reactive metal.
✓

Answer

Correct option: B.
Has more affinity for oxygen.
Thermite is the trade name for one of the granular mixtures of aluminium metal and powdered ferric oxide as the chemical affinity of $Al$ for oxygen is the basis of thermite process$. Al$ is common because of its high boiling point and low cost. It is used in welding process to join railway tracks.

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