Aluminothermy used for the spot welding of large iron structures is based upon the fact that:

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As compared to iron, aluminium has greater affinity for oxygen

As compared to aluminium, iron has greater affinity for oxygen

Reaction between aluminium and oxygen is endothermic

Reaction between iron oxide and aluminium

answer is N.

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Detailed Solution

Al reacts faster and more-ever the concept of heat has no role here.

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