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Question

Aluminium powder is used in thermite welding because :

A
it is a strong reducing agent
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B
it is a strong oxidising agent
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C
it is corrosion resistant
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D
it is a good conductor of heat
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Solution

The correct option is A it is a strong reducing agent
The reduction of the metallic oxide with Al is known as the thermite process. Aluminium is used as a thermite mixture in thermite welding. Al powder is used as it is a strong reducing agent and it reduces Fe2O3 to iron. Reduced molten iron sinks and flows into the gap of the grinder thereby welding it.

Fe2O3+2AlAl2O3+2Fe

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