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
In thermite welding, to ignite the mixture we use:
✓
Magnesium ribbon
B
Potassium ribbon
C
Calcium ribbon
D
Manganese ribbon
✓
Answer
Correct option: A.
Magnesium ribbon
Thermite welding also known as exothermic welding and the reaction of metal oxide and aluminium powder reaches very high temperature. The activation energy for this reaction is very high and the initiation requires the use of a booster material such as powder magnesium metal.
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